"The Rolls Royce of Reception"
  By Richard T. Ammon
    Last updated:  2/4/08 - 738 Copyright 1999 - 2007   All Rights Reserved                                               
\\   COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                          DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS 
  X Abbott Abbott Radio Mfg. Co. Abbott 8 Compartment Type X February 1927 M 8 8 - 201A or 199 12 x 28 2 - Drum 3 N (L) (Abbott) Thick Square X NIF NIF NIF Harry Abbott       Chicago CO-OP Monthly - February 1927 - P82       No Scheme Found   eBay pictures.  This set was obviously manufactured; not a kit. Two rows of four 201A sockets. "This set embodies the latest advances in radio engineering principles."  "Completely shielded." "Can be used with 199 tubes, but 201-A tubes are recommended for best results." "Grained mahogany cabinet."  "List with accessories, $125. Ea. 73.50"  Also see Abbott under RCA below. "12" high, 15" deep, & 28" long". 
  X   "    " "    "    "    "    "    "    "    " Abbott 8 Table Type X February 1927 M 8 8 - 201A or 199 12 x 28 2 - Drum 3 N (L) (Abbott) Thick Square X NIF NIF NIF Harry Abbott "    "    " CO-OP Monthly - February 1927 - P82   No Scheme Found This set was obviously manufactured; not a kit. Two rows of four 201A sockets. "This set embodies the latest advances in radio engineering principles."  "Completely shielded." "Can be used with 199 tubes, but 201-A tubes are recommended for best results." "Grained mahogany cabinet. 12" high, 15" deep, 28" long". "Legs are removable." "List with accessories, $150. Ea. $88.26". Also see Abbott under RCA below.
  X Acme Acme Apparatus Company Long Wave  30 K.C. Transformer X May 1924 P n / a n / a n / a n / a n / a n / a n / a Acme 30 K.C. Open Frame X 42 Heavy Laminated Iron n / a Cambridge, Mass. Chicago Salvage Store - Catalogue #14 -1926 X QST - December 1924 - P9 - Transformer "30 K. C." only X n / a Transformer peaks at 7100 meters (42 K. C.). Referenced QST - May '24 - P72.  See E. I. S. for usage. Sold these transformers as late as 1929 (Lewis Radio Jobbers).
  X   "    "    "    "    "    "    "    "    " Eight Tube Superheterodyne X May 1924 CK 8 8 - 201A or WD12 or 199 7 x 30    engraved 2 5 - 6 N (L) Acme 30 K.C. Open Frame X 42 Heavy Laminated Iron Two Duo-Laterals Coils "    "    "    "    "    " Chicago Salvage Store - Fall -1924 X Used honeycomb (Duo-Lateral) coils shunted by a fixed condensers for Input (Filter) stage. Oscillator coupler (variometer) with a variable pickup coil is used. Used two Acme enclosed variable condensers and two Acme audios. Used 201As, WD12s, or 199s with adapters.  Used 200A in second detector.  Chicago Salvage promotes this as a "knockdown", which is not a legal (RCA) term.  Chicago Salvage priced the $78 complete kit at $58.85 in the Fall of 1924. 7x30 inch engraved panel.
  X Acme - Benson n / a Benson Reflexed Super-Heterodyne   February 28, 1925 B 6 [+ 1] * 6 - 199 or 201A (7 x 24) 2 3 N L (Acme Type R3) Small Rectangular X 500 Iron NIF Thomas W. Benson NIF RWI - March 7, 1925 -Part 2 - P8 - Construction / Wiring X RWI - April 4, 1925 - Revised - P9 - Scheme)   Two part introduction and construction of this reflexed Super in Feb. 28 & March 7, 1925 RWI issues. Layout in March 7. Used Acme 600 meter RF transformers (Type R2 or R3) for IF; very unusual! Used 6 tubes and a Brownlie Crystal Detector (6+1). Original set used 199s, but Benson says 201As will work. Used Plate Modulation of Ultradyne fame.  Benson said reflexing was easier with the higher intermediate frequency, possibly 500 KC [??]. That's close to the standard 455 KC today. Benson is called "Noted Radio Engineer" in article.  ??x?? panel.
    Acme - Custom-Built n / a Seven Tube Custom-Built Superheterodyne X (1926) CB 7 7 -  (10 x 24) 2 1 N NIF (Acme Type R3) Small Rectangular X   Iron NIF Ron Lawrence owns this beautiful radio. Has an aluminum-lined case and uses Acme "D" coil attached to the variable condenser as in the Reflex kit. Aluminum front panel approximately 10x24 inches.  
  X Adams n / a Eight-Tube Superheterodyne X October 1924 B 8 8 - 201A 10 (?) x 30  2 7 1 - V L or W Adams Flattened Side                      Tuna Can X NIF NIF NIF Captain H. J. Adams Camp Vail, N. J. PEPL - November 22, 1924 - P3 - Construction X No Scheme Found In the Philadelphia Evening Public Ledger, "The Radio" section, November 22, 1924, is the fourth in a series started October 25, 1924 and ending November 29 with the construction of the IF transformers. Captain H. J. Adams was the Army's Chief Communications Instructor Twenty-eighth Division, United States Signal Corps. For the times, different layout design using subpanel.  Oscillator coil has three wound sections.  Very small Pickup coil next to tube one's socket.  Adams IF transformers are round (Tuna Can) except one-quarter flatten on the side to allow it to stand straight up. A small loop antenna can be used with the Captain Adams. 10(?)x 30 inch panel. 
  X Aero Aero Products, Inc. Aero Coil Oscillator X October 1925 P n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a Chicago CRCB - Summer 1926 X n / a Oscillator coil only. Original cost $5.50.  Got down to $3.30.  Last advertised Alter catalog October 1927. Addressed at 1772 Wilson Avenue.
  X Aero Dyne Aero Radio Co. Aerodyne Standard X (1924) M 7 7 - 201A NIF 2 3 N L NIF   PNF   Detroit Aero Radio Brochure X These appear to be completely wired and ready to play. Taken from brochure: Called "Rolls Royce of Reception". "Two tone solid walnut cabinet - Wax finish. Walnut bakelite panel. Full base panel. All wiring completely concealed. Battery cable with each terminal permanently marked. Straight line frequency condensers. Combination battery and amplification switch. Manufacturer's warranty covers the entire set. Factory service department is at your disposal. Only the finest materials are used in its construction. Every Aerodyne is a masterpiece of workmanship." "Manufactured...20 West Wakken Avenue". "Standard" Used 201As. Designed for a loop.  $200.00.
  X   "    "    " "    "    "    "    " Aerodyne Premier PNF (1924) M 7 7 - 201A NIF 2 (3) (N) (L) NIF   PNF   "    " "   "   "   "   "   "   " X See immediately above for details. "Built-in horn with Amplion unit". Designed for a loop. $285.00.
  X   "    "    " "    "    "    "    " Aerodyne - The Luke PNF (1924) M 7 7 - 201A NIF 2 (3) (N) (L) NIF   PNF   "    " "   "   "   "   "   "   " X See immediately above for details. "(Wall) console with built-in directional loop and horn with Amplion unit. Space for all batteries and charger." $400.00.
    Aircore (Radiophone Equipment Co., The) Aircore Super Eight   September 1924 (K) 8 NIF   2   NIF Aircore   PNF   Air Air RB - September 1924 - P480ish   Shown in unrelated "Timmons Talkers" ad in RB, Sept '24.  Has two tuning dials and five rheostats. Nothing else is known.
  X Airkore Radiophone Equipment Co. Airkore Super-Heterodyne Kit X November 1924 K 8 NIF NIF NIF NIF NIF NIF Airkore Cylindrical X NIF Air Air     Philadelphia R - February 1925 - Kit & Blue Prints X Good ad in RB Nov '24 P156. Kit: $20. R, November 1924, Kit & Blue Prints.  "Non-magnetic shield". "Accurately matched in sets of four".  Three IFs and a matched Filter transformer. Radio ad of Jan 1925: "Improved".  Transformers listed in RTD, Feb '25 & RTD, Aug '25.  Addressed at 1409 West York Street, Philly
  X All American  Rauland Mfg. Co. Long Wave Radio Frequency Transformer Model R-110 X May 1924 P n / a n / a n / a n / a n / a n / a n / a All American Misc X 30 Iron Air Chicago R - May 1924 - P84 - IF Transformer X First advertised in R & RN - May '24.  IF transformer only ($6). Says "Build 'the Rolls-Royce of Radio". "For wave lengths 4,000 to 20,000 [15 to 75 KC]. IFs peak at 30 KC. R - May '24 also shows first reference to the nickel-plated "Type R-110" IF transformer only.  (No reference to a "Kit".)   Called "All American" from the 82nd Army Division he was in in WWI. See Douglas book for details. Ads addressed at both 2642 and 2650 Coyne Street.
  X   "    "    "    " "    "    "    "    "    " Super-Fine Kit X September 1924 K 8 8 - 201A n / a n / a n / a n / a n / a All American Tuna Can / Misc X 30 Iron Air "    "    " R - May 1924 - P84 - IF Transformer X First advertised in R & RN - May '24.  IF transformer only ($6). Says "Build 'the Rolls-Royce of Radio". "For wave lengths 4,000 to 20,000 [15 to 75 KC]. IFs peak at 30 KC. R - May '24 also shows first reference to the nickel-plated "Type R-110" IF transformer only.  (No reference to a "Kit".)   Called "All American" from the 82nd Army Division he was in in WWI. See Douglas book for details. Ads addressed at both 2642 and 2650 Coyne Street.
  X   "    "    "    " "    "    "    "    "    " Super-Fine Super Heterodyne X September 1924 BK 8 8 - 201A or WD12 or 199  7 x 30 2 5 N L All American Tuna Can / Misc X 30 Iron Air A. Elkins "    "    " PR - July 1924 - P39 - Kit X CRCB - Fall 1924 - P46 - Construction X CRCB - Fall 1924 - P48 - Construction X Kit named "Super-Fine".   R - Sept '24 shows "Type R-120 Air Core 10000 Meter Filter", "Type R-130 Short Wave RF Coupler" [Oscillator Coupler] and "Key Book" first mentioned. Also see QST, Dec '24, P105, Kit.  Standard catalogue for Spring'26 calls it "DeLuxe". 
  X   "    "    "    " "    "    "    "    "    " "Music Room" Super-Heterodyne  X September 1925 BK 8 8 - 199 or 201A 7 x 18 2 2 N TL All American Tuna Can / Misc X 30 Iron Air "    "    " CRCB - Fall 1925 - P103 - Parts   CRCB - Fall 1925 - P99 - Construction   CRCB - Fall 1925 - P101   Designed by the CRCB Laboratory. CRCB, Fall '25 ad shows all the transformers, 30 KC (10,000 meters) filters, and coils. Radio Review, Oct '25, P35: Short article and scheme with no values.  Barawik catalogue for Fall '25 and Spring '26 says "As specified and Designed by Citizens Radio Call Book Laboratory…The Music Room Super-Heterodyne. $69.50." Also, RR, Oct '25, P35, lite construction.  Construction and advertising show 199 tubes, but my set has 201As. Reportedly, this radio appeared in 1925 in RN also (No month given).  Also see Note 21.
  X All-American - Brush n / a Kodak Size Midget 45 K.C. Best Super X Spring 1925 BK 7 7 - 199 5 3/4 x 11 2 4 1 - V TL or W All American Tuna Can / Misc X 30 Iron Air Gerald M. Best X W. P. Brush, Designer San Francisco RR - October 1925 - P11 - Lite Construction   RR - October 1925 - P13   "Radio" magazine for 1925 (Month unknown, "First part of this year") has full construction article by Clinton Osborne. RR, May '25, list numerous brands of IFs for use in this radio. They must all be near 45 K.C.: All-American, Baldwin Pacific, Branston, Jefferson, Phenix, Receptrad, Remler, and Silver-Marshall.  The All American Oscillator Coupler was NOT used here, likely a Remerl 631.  RR, Oct '25: Construction of untuned & tuned 45 KC IFs shown. Same construction info, woodcut pictures, and scheme in RN, "Superheterodyne" book. Operated on tuned loop, but there is a schematic of an adapter for use with a long wire antenna in RN, "Superheterodyne" book. See Note 21. Super small: 7 1/2 pounds sans batteries.
    All American - Calcaterra n / a Practical Super-Het   May 1925 BK 8 8 - 199 7 x 18 2   All American Tuna Can / Misc X 30 Iron Air Joseph Calcaterra New York City RA - May 1925 - P19 - Construction X RA - May 1925 - P20 / 21 X It is the All American "Super-Fine Super Heterodyne Kit", but in a smaller format; almost half sized (18 inch panel compared to the original 30 inch panel). 10, 000 meter (30 KC) IFs.  All-American parts: Type 130 RF Coupler [Oscillator Coupler], Type 110 Long Wave RF Transformers, & Type 120 10,000 meter tuned RF Transformer. Used 199s. See All American - Standard Radio Supply below. Likely the complete kit for this same configuration. 7x18 inch panel.
    All American - Custom-Built n / a Custom-Built Three-Dial Superheterodyne X (1925) CB 8 8 - 201A (7 x 36) 3 9 1 -V                   & 1 - MA NIF All American Tuna Can / Misc X 30 Iron Air   Three dial radio. Ron Lawrence owns this beautiful, huge Superhet. DeForest-style tuning on front end. Front panel approximately 7x36 inches.  
    All American - Randolph Randolph Radio Corporation 8-Tube Super-Heterodyne X October 1924 CK 8 8 - 201A or WD12 or 199  8 x 36 2 5 N TL All-American Tuna Can / Misc X 30 Iron Air Chicago RN - October 1924 - P509 - Complete X Used either All-American or Columbia (shown in picture) IFs.  Randolph was a parts clearing house selling cheap kits. $59.75 ^  Pictured with Allen-Stats.
  X All American - Standard Radio Supply Standard Radio Supply All American Deluxe 8-Tube Super X Spring 1926 CK 8 8 - 199  7 x 18 2 2 N TL All American Tuna Can / Misc X 30 Iron Air Chicago Standard Catalogue - Spring 1926 X Standard [Radio Supply] sold the "Super-Fine Essential Kit" with 199 tube sockets and their choice of parts to make a smaller footprint. Complete parts $87.00.  With batteries & tubes, $126.65.  See All American - Calcaterra above.  Likely the same configuration. 7x18 inch panel.
    AMACO American Apparatus Co. (Amacodyne CN-8)   November 1925 (K) (8)     Richmond, Indiana RN - November 1925 - P686 - Radio Set Directory RN,  Nov '25 says "…Dry cell or storage [batteries]…Outdoor or indoor [antenna]".  NC-8 Used separate speaker, has one control, and is $60.   This company might have association with the Quality Radio Shop's "Hi-Power Long Wave Super Heterodyne Transformers" from the Fall of 1925 [see below].  Transformers still listed in RTD, Aug '25.
      "    "    "   "    "    "    "    "    "    "    " (Amacodyne CN-9)   November 1925 (K) (9)     "    "    "    "    "    " RN - November 1925 - P686 - Radio Set Directory RN,  Nov '25 says "…Dry cell or storage [batteries]…Outdoor or indoor [antenna]". NC-9 Used a Baldwin speaker built-in, has one control, and is $80.  This company might have association with the Quality Radio Shop's "Hi-Power Long Wave Super Heterodyne Transformers" from the Fall of 1925 [see below].
    American Radio American Radio Manufacturing Co. Super-Assembly 7 Super-Heterodyne   September 1924 SA 7     Kansas City, Mo. American Radio Mfg. Catalogue - Sept 1924 - Back - Complete   "Baseboard instruments, panel instruments includes cabinet with collapsible loop for $77.95". "Semi-assembled". 
      "    "    "    "    "   "    "    "    "    "    "    "    "    "    "    "    " Acme Double 'A' Super-Heterodyne   September 1924 (K) 7     "    "    "    "    " RN - September 1924 - P366 - Kit / Engraved  Panel   "Acme Parts Kit Only $69.13". American Radio Mfg. Co. is "Wholesale Distributors".  Also, see "Acme".
    Amplex Amplex Instrument Labs. Cockaday Improved ?? Super-Heterodyne Kit   September 1924 K             New York City RN - September 1924 - P437 - Reference Only "Build your set the Amplex 'Kit' way! Save Money, Time and Trouble. Cockaday Improved…Super-Heterodyne…". Another kit reference in PR, Feb '26, P187: "What's New...Apparatus Approved by Popular Radio".
    Armstrong Armstrong, Major Edwin Howard Five Tube Super Auto-Dyne   May 16,1918 CB 5     Armstrong Resistance Coupled Resistance Coupled Major Edwin Howard Armstrong, inventor X Paris, France Super Het Disclosure Form [AEF]                                          June 3, 1918 - P2 - [Note 24] Sets made at 140 Boulevard Montparnesse in Paris from ideas gleaned in February 1918 (Note 4, P70-71). First Super Het demo'ed May 16, 1918.  Used VT1s. RC IF network. Associated with Armstrong was Houck & Pressley. Story of Super-Het on page 198 in July 1924 RB  Armstrong applied for French patent on his superheterodyne circuit on December 30, 1918. Applied for U.S. patent in February of 1919 (issued in June 8, 1920, #1,342,885). His U.S. patent was overturned by the U.S. District Court of Appeals of the District of Columbia in December of 1928. A Frenchman, Lucian Levy, was judged to have disclosed basic principals of the circuit in 1917. So why do so many consider Armstrong to be the inventor of the superheterodyne? Walter Shottky may have stated it best in 1926: "The "word" seems, at any rate, to have been far less important than the "deed," and there appears to be no doubt that it is Mr. Armstrong and his collaborators to whom we owe the deed, which has made the super-heterodyne method such an invaluable instrumentality in radio engineering." (Must reading is "Who Invented the Superheterodyne?" by Alan S. Douglas, The Legacies of Edwin Howard Armstrong, published by The Radio Club of America, 1990.).
      "    "    " "    "    "    "    "    "     "     "     "     " Six Tube Super Auto-Dyne   Summer 1918 CB 6     "    "    "    " Resistance Coupled Resistance Coupled   "    "    "    "    "    "    " "    "    "    " RN - Feb 1920 - P403 - Construction X RN - Feb 1920 - P404 X Likely the third.  Shown in PR, Nov '24 as constructed "during the summer 1918".  RN Feb 1920 article has caption under pix: "One of the first…built in Armstrong's Paris laboratory."  Vellum plans for 2 Supers dated 11/18 & 12/18 shown on "eros.com".   
      "    "    " "    "    "    "    "    "     "     "     "     " Eight Tube Super Auto-Dyne   Summer 1918 CB 8     "    "    "    " Resistance Coupled Resistance Coupled   "    "    "    "    "    "    " "    "    "    " RN - May 1924 - P?? - Picture X Likely the second.  Vellum plans for the first two Supers dated 11/18 & 12/18 shown on "eros.com". Pix with Houck & Armstrong in 1924 shows original 8 tuber. After Armstrong's death, artifacts with the greatest historical significance went to various museums. First Superhet went to Smithsonian. The second model superhet (likely the 6 tube set) from France went to the Signal Corps Museum at Fort Monmouth, the "honeymoon" suitcase portable second harmonic superhet went to the Ford Museum and prototypes of the RCA six tube second harmonic superhet went to the Smithsonian and AWA.
      "    "    " "    "    "    "    "    "     "     "     "     " Five Tube Super Heterodyne ???   1919 CB 5     "    "    "    "     "    "    "    "    "    "    " Yonkers Note 4: P91 & 92.  Built with Houck after returning to the US in late??? 1919.
      "    "    " "    "    "    "    "    "     "     "     "     " Seven Tube Super Auto-Dyne   February 1920 CB 7     "    "    "    " Resistance Coupled Resistance Coupled   "    "    "    "    "    "    " New York City RN - Feb & March 1920 - P403 & P?? - Construction X RN - February 1920 - P405 X RN article by Harry Houck. Similar scheme in Radsco Catalogue # 11, early '24 directly below. Believed designed at Columbia U. Used honeycomb coils.
      "    "    " "    "    "    "    "    "     "     "     "     " Seven Tube Super Auto-Dyne   Summer 1920 ?? CB 7     "    "    "    " Resistance Coupled Resistance Coupled   "    "    "    "    "    "    " "    "    "    "    "   Radsco Catalogue # 11 - Figure 33 - Early 1924 X Resistance-coupled. See directly above. Used honeycomb coils.  This is a more complex schematic.
      "    "    " "    "    "    "    "    "     "     "     "     " Super Heterodyne Using Audio Transformers   Summer 1920 ?? CB 8     "    "    "    " Resistance Coupled Resistance Coupled   "    "    "    "    "    "    " "    "    "    "    "   PR - June 1923 - P468 / P469 X Resistance-coupled. See directly above. Used honeycomb coils. This is a more complex schematic. Used audio transformers.
      "    "    " "    "    "    "    "    "     "     "     "     " Six Tube 2nd Harmonic Super Heterodyne   Fall 1921 ?? CB 6     "    "    "    " 60 Air Air   "    "    "    "    "    "    " "    "    "    "    " (R - May 1922?? - P ?? - Picture) X 100 Radio Hookups - Dec. 1924 - P53 X First second harmonic. 100 Radio Hookups - Dec. 1924  (Note 23)  Besides actually building all of the pre-production models, Harry Houck's main contribution, to what would become the first RCA production superhet, would be his second harmonic invention. There were several inherent advantages to this scheme - reduction of one tube by combining the functions of oscillator and first detector; elimination of antenna radiation, and; reduced interaction between antenna and oscillator controls. Houck saved an additional tube by reflexing the first IF amplifier back through the RF amplifier. Drawing from Houck's second harmonic patent filed March 3,1923, #1,686,005, issued on October 2, 1928.  Harry Houck would eventually receive at least $100,000.00 from Armstrong for his work on the superheterodyne. Just a few days before filing for his second harmonic patent, Houck assigned rights to Armstrong.
      "    "    " "    "    "    "    "    "     "     "     "     " Five Tube 2nd Harmonic Reflexed Super Heterodyne   February 1923 CB 5     "    "    "    " " " "   "    "    "    "    "    "    " "    "    "    "    " RB - July 1924 - P ??? - Pictures X Another version of 2nd harmonic with only 5 tubes and built-in horn probably used to demonstrate to RCA's David Sarnoff and another for Owen Young.. Interior shows hap-hazzard construction. Article RB, July '24 says this set was used in Massachusetts by two women with no radio experience who received 2LO , London. This was on Dec.1, 1923 for the Trans-Atlantic tests sponsored by Radio Broadcast and Wireless World (London) magazines.
      "    "    " "    "    "    "    "    "     "     "     "     " Four Tube 2nd Harmonic Reflexed Super Heterodyne   February 1923 CB 4     "    "    "    " " " "   "    "    "    "    "    "    " "    "    "    "    " Reference made to a four tube set in a letter to Armstrong from RCA Research Dept, March 10, 1923.
      "    "    " "    "    "    "    "    "     "     "     "     " Six Tube 2nd Harmonic Reflexed Super Heterodyne   Spring / Fall 1923 CB 5 / 6     "    "    "    " 60 Air Air   "    "    "    "    "    "    " "    "    "    "    " R - May 1922 ???- P ?? - Picture X Note 24 - Six Tube Schematic Prototype for RCA second harmonic. Started as 5 tube set in Spring, but a 1st RF stage was added in Fall 1923 by RCA so the set would work better within steel buildings. See previous five tube version. Used UV 199s. 
      "    "    " "    "    "    "    "    "     "     "     "     " Portable Six Tube Super Heterodyne   December 1923 CB 6     "    "    "    " " " "   "    "    "    "    "    "    " "    "    "    "    " RDI - February 16, 1924 - Back - Picture Shows Mr. & Mrs. Armstrong at Palm Beach, Florida, with HER new Super Het on their honeymoon. This is a 2nd harmonic set. 
      "    "    " "    "    "    "    "    "     "     "     "     " Super-Regenerative-Heterodyne Combination   February 1924 CB 4     "    "    "    "   "    "    "    "    "    "    " "    "    "    "    " RDI - February 16, 1924 - P6 - Article RDI - February 16, 1924 - P6 A combination of the Super Het & the Super Regen was invented by Armstrong and presented to the meeting of the Radio Club of America by George Eltz (See below) & E. H. Armstrong in Feb '24. "'It works', but not perfect yet!" See schematic which is exclusive of audio stages.
      "    "    " "    "    "    "    "    "     "     "     "     " Eight Tube Transformer-Coupled Super Heterodyne   Summer 1924 CB 8     "    "    "    " 60 ?? ?? ??   "    "    "    "    "    "    " "    "    "    "    " RB - July 1924 - P?? - Pictures E. H. Armstrong used to demonstrate Super Het circuit. IFs shielded.
  X Atlantic & Pacific Radio Co. Atlantic & Pacific Radio Co. Improved and Practical Super-Heterodyne PNF January 1924 M / K 8 (201A) NIF 2 (1) N NIF (Atlantic & Pacific         Radio Co.) NIF PNF NIF NIF NIF Chief Engineer & Staff New York City RN - May 1924 - P1684 - Manufactured / Complete X A complete description of this set was printed in "New York Evening Mail Radio Magazine" for Jan. 19, 1924. Ad says, "Rolls Royce of Radio". Sold as manufactured set in May 1924 (X) for $150 in "beautiful piano finish solid mahogany cabinet and unconditionally guaranteed for one year" and complete parts for $75. Then in June 1924 (X) they advertised only the complete kit/parts. Leutz/RCA law suit had an effect. Ads for just a couple of months. Regeneration here. Tuned plate circuit on first stage for better amplification.  Was it a re-packaged (something of someone else) set?
    Atwater Kent (Atwater Kent Mfg. Co.) (Eight Tube Superheterodyne)   (1924) CB 8                                 (Philadelphia)             [From Dale davenport:]   Truth is, I've never been sure about the AK "Super." I've had it for years [2003] and it's currently in the attic of my shop,   somewhere. It's stood on one end on a dirt floor and is in pretty sad shape. It's exactly like a model 20 ,but it's about three feet long. The front panel is like a model 20 in that the holes, knobs etc. that are model 20 ( or 10 ) and it has only two dials, set to the left side.  he front panel is metal,  same guage as a 20,  has the spot welded little rail / shelf along it's length at the back, supporting the various pieces, all of which appear to be AK model 20 ( or 10 ).  From memory, it has two large tuning dials to the left with a standard AK tap switch set between them at the bottom,   a AK lozenge nameplate top center,  two of the AK model 20 rheostat islands set to the right (mirror image to the tuning knobs to the left). I don't remember if it has two on / off switches or not but seem to remember that it does and one is "A" and the other "B" source. The little support rail looks like AK too but "I thought" it looked a little "cobbier" than a usual stamped one and that would make sense for a "one of"  model I guess. Yes, it does have the milled corner "trim" buttons. Paint is too far gone to tell but seems to have been the standard AK "Crystalline" finish rather than wrinkle. Circuitry is made up of various AK 20 Bakelite tube islands, single, triple, etc. The tuning condensers are metal frame like those in a model 10 rather than the bakelite model 20 type.   The AFs and IFs are what appear to be normal model 20 "can" types mounted in the usual way on the bakelite. Whole thing is eight tube (if I remember correctly.)  Wiring and coils antenna coil are pretty much standard looking for a model 20.  One coil seems to be a usual tapped antenna model and the other wound to be a coupler with a little AK knob (like on the tap switch). Where did it come from?  Beats me,  I got it in a trade years ago with a fellow in PA (interesting hunh?).  He had picked it up at a local auction as I recall and thought it was a home brew. Prototype??  No other information available.
  41    41 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
  X Baby Grand n / a Six-Tube Baby Grand Super-Heterodyne X January 1925 B 6 6 - 199 7 x 18 2 1 N TL [Haynes-Griffin] Square X (100) Iron n / a Paul Green       Chicago     RA - January 1925 - P15 - Lite Construction   RA - January 1925 - P16 - Layout   All parts are staggered - unusual. The author says this layout must be religiously adhered to or there will be no results. Two IF transformers and one audio. The IFs shown are unknown and article doesn't tell. They are black blocks with a label that has a circle-like logo. (There were three known companies that made black square IFs: Hayne-Griffin, Sangamo, and Abbott.) The output coil is home-wound on a bobber of 2 inch diameter with a 1 inch core. Pictured with enclosed Acme tuning capacitors.  Interesting layout for a 6 tube design. Used 199s. Used a flashlight battery soldered in for grid bias. Claims it can be made for $55.  Baseboard 10 inches deep. 7x18 inch panel.
  X   "    "    "    " n / a Improved Six-Tube Baby Grand Super-Heterodyne X March 1925 B 6 6 - 199 8 x 15.5 2 3 N TL (Silver Marshall) Misc X 30 Iron Specifically, Iron Paul Green Chicago RA - March 1925 - P23 - Lite Construction X This layout is standard compared to the previous version. Two IF transformers and one audio, all of same make. IFs are unknown and article doesn't tell.  No flashlight battery in this version. Used 199s. Attached bankwound loop is 19x19 inches. The IFs under the baseboard likely are Silver Marshall  8x15.5 inch panel.
    Baby Heterodyne n / a Single Tube Baby Heterodyne   February 1924 B 1         John B. Rathbun (San Francisco) RA - February 1924 - P?? - Construction Appears to be an oscillator/mixer stage only with feedback. Says to not use WD11s or WD12s. 201As and 199s are okay.  Referenced in RA, Oct 1924: Letter to Editor [Have as JPG.]  
      "    "    "    "    "    " n / a Baby Heterodyne With Two Audios   May 1924 B 3         John B. Rathbun "    "    "    "    " RA - May 1924 - P42 & 44 RA - May 1924 - P44 Oscillator/mixer stage with feedback and two audios. Two short articles about improvements.
  X   "    "    "    "    "    " n / a Baby Heterodyne With RF and Audio Stages PNF June 1924 B 5 5 - 201A or 199 (7 x 18) 4 or 2 3 N W Not Used Not Used   NIF n / a n / a John B. Rathbun "    "    "    "    " RA - June 1924 - P21 - Lite Construction X RA - June 1924 - P21 - Scheme X Can be configured as a Four-dial Super. The detector Stage is the single tube heterodyne stage making it a Superhet, much like the Oscillator/Mixer stages from years later. With the use of untuned RF transformers such as "Acme, Ralsa, Erla, and others", the two additional 17 plate condensers can be eliminated with degradation of performance in selectivity and volume. This would give the appearance of a two-dial Super. This is a single oscillator/mixer stage with feedback and the addition of two RF stages and two AF stages. The first two RF stages utilized "any Neutrodyne coil" for the amplification factor of 8 to 1 per stage. Any iron core audio transformers were used if they were 5 to 1 ratio for the best results. Used a flashlight cell for 4.5 volt bias. Used a 50-turn honeycomb coil and variable condenser (size not giving in this construction article) for the feedback loop. "It goes without saying that all the tubes, detector tube (3) included, must be hard amplifying tubes, such as UV201A, C301A, and UV199 or C299. A soft tube like the UV200 will not work at the high plate voltages."  
    Baby Heterodyne II n / a Baby Heterodyne II   September 1924 B 1         John B. Rathbun "    "    "    "    " RA - September 1924 - P31 - Construction RA - June 1924 - P32 & P33 - Layouts Appears to be an improved oscillator stage only with feedback.  
    Baby Super Four n / a Four Tube Baby Super   July 11, 1925 B 4 [+ 1] *   3         J. E. Anderson   "    "    "    "    " RW - July 11 & 18, 1925 - P?? - Construction RW - January 2, 1926 - P13 - Scheme This is a three-dial Super using three .0005 mfd variable caps, two being double condenser caps. The first stage is a regenerative, tuned RF. The first detector also is regenerative. No brand name given for the IFs shown as air core.  Amperites in all filament circuits.  Anderson was Technical Editor ?? of RWI in 1925 ??   Referenced in RW, Aug 1, 25, P11 and Aug 8, 25, P24: Letters to Editor [Have as JPG.]  See "DX Super-Heterodyne" under RWI [November 21, 1925] below. It's the same radio with additional stages.
    Baby Super Six n / a Six Tube Baby Super   July 11, 1925 B 6 [[+ 1] *   3         J. E. Anderson   "    "    "    "    " RW - July 11 & 18, 1925 - P?? - Construction RW - January 2, 1926 - P13 - Scheme This is a three-dial Super using three .0005 mfd variable caps, two being double condenser caps. Six tube set has a fixed crystal for the first detector, making it equivalent to seven tubes. The first stage is a regenerative, tuned RF. The first detector also is regenerative. No brand name given for the IFs shown as air core.  Amperites in all filament circuits.  Anderson was Technical Editor ?? of RWI in 1925 ??   Referenced in RW, Aug 1, 25, P11 and Aug 8, 25, P24: Letters to Editor [Have as JPG.]  See "DX Super-Heterodyne" under RWI [November 21, 1925] below. It's the same radio with additional stages.
    Badger Radio Badger Radio Super-Heterodyne Kits   December 1924 K             Milwaukee, Wis. RDI - December 13, 1924 - P30 - Kit "Dealers…Super-Heterodyne Kits…Complete Parts and Information…Send For Catalogue".
  X Baldwin Nathaniel Baldwin Headphone Co. Nine Tube Superheterodyne X 1924 M 9 NIF (7 x 24) 2 5 1 - V NIF (Baldwin) NIF PNF NIF NIF NIF NIF Salt Lake City (AWA OTB Picture & Caption) X Details in the caption under the picture, possibly from the AWA OTB, says "Ernie Hite's Nathaniel Baldwin Nine Tube Superheterodyne. It is a factory produced set, made by the Nathaniel Baldwin Headphone Company in 1924, in violation of the RCA patent on the superhet circuit." Fine tuning handles under each tuning knob. Very nice cosmetics. Nothing more is known. [2/2/07- Is it possible this set was made by the Baldwin Radio Electrical Mfg. Co. of 684 Bergen St., Brooklyn, NY as shown in RTD, Feb '25??]
  X Baldwin-Pacific Baldwin-Pacific & Co. Pacific "S-H" Transformers # 5 & #10 X April 1924 K n / a n / a n / a n / a n / a n / a n / a Baldwin-Pacific Short Cylindrical X 45 (Iron) (Air) (Gerald M. Best ??) X San Francisco R - April 1924 - P87 - Short Kit X Note round label on top of round case. I believe the case is shielded as there is a reference to a shielded case in the article for the "Baldwin Pacific - Best" radio. The #5 transformer is the IF [three required] and the #10 is the Filter transformer [one required]. Black nickel trim finish.  "…hook-up print packed with each transformer."  Radio, May & June 1924, ads says "A complete knock-down SUPER SET ready soon." [Knockdowns were illegal by RCA injunction.]  Manufacturer associated with "Radio" magazine (Pacific Publications) in San Francisco. Is Baldwin the same as Nathanial Baldwin? Very possible. It's also possible Gerald M. Best created this for Baldwin-Pacific Company just before he went to Remler. In 1926, it's reported he endorsed the circuit. See Remler. Addressed at 441 Pacific Building, San Fran. 
  X   "    "    "    "    " "    "    "    "    "    "    " Pacific Ranger "Pacific Quintet" Super-Het Kit X November 1924 K n / a n / a n / a n / a n / a n / a n / a Baldwin-Pacific Short Cylindrical X 45 (Iron) (Air) (Gerald M. Best ??) X "    "    "    "    " RN - November 1924 - Kit X Kit: One Pacific "Ranger" # 30 Oscillator Coupler, three Pacific "Ranger" # 25 Intermediate Frequency Transformers, and one Pacific # 20 "Ranger" Filter Transformer.  $15.  Also called the "Pacific Quintet" due to the five parts in the kit. I believe the case is shielded as there is a reference to a shielded case in the article for the "Baldwin Pacific - Best" radio. By Aug '24, the label on top of the IF can was rectangular. Known as "Pacific Ranger" and also as the "Pacific Quintet".  45KC IFs . See CRCB, Fall '24, P144.  Bill Dial, Denver, says: "The schematic shows the 8 tube Armstrong circuit (1918 patent) using General Electric UV199 tubes. Later called "The 'New Marvel' 45,000 Cycle Kit" in R - May 1925 -P80. Barawik: Fall '25, P17, $11.95.  Called "Pacific Rainbow" in PR, Feb '26, P187 said "Apparatus Approved…". Believe this set was advertised in Spring 1926 Barawik catalogue, page 22.  Advertised "Noise Filter" #15 in R, May 24, which looked like the other transformers.  Called a "knockdown" in RTD, Aug '25.
  X   "    "    "    "    " "    "    "    "    "    "    " Pacific Ranger "Pacific Quintet" Super-Het X November 1924 BK 8 8 - 199 6 x 26 to 30 2 3 1 - V TL Baldwin-Pacific Short Cylindrical X 45 (Iron) (Air) (Gerald M. Best ??) X "    "    "    "    " CRCB - Fall 1924 - Complete Kit X Kit: One Pacific "Ranger" # 30 Oscillator Coupler, three Pacific "Ranger" # 25 Intermediate Frequency Transformers, and one Pacific # 20 "Ranger" Filter Transformer.  $15. I believe the case is shielded as there is a reference to a shielded case in the article for the "Baldwin Pacific - Best" radio.  By Aug '24, the label on top of the IF can was rectangular. Known as "Pacific Ranger" and also as the "Pacific Quintet".  45KC IFs . See CRCB, Fall '24, P144.  Bill Dial, Denver, says: "The schematic shows the 8 tube Armstrong circuit (1918 patent) using General Electric UV199 tubes. Later called "The 'New Marvel' 45,000 Cycle Kit" in R - May 1925 -P80. Barawik: Fall '25, P17, $11.95.  Called "Pacific Rainbow" in PR, Feb '26, P187 said "Apparatus Approved…". Believe this set was advertised in Spring 1926 Barawik catalogue, page 22.  Advertised "Noise Filter" #15 in R, May 24, which looked like the other transformers.  Called a "knockdown" in RTD, Aug '25.
  X   "    "    "    "    " "    "    "    "    "    "    " Pacific Ranger Super-Het X Spring 1926 CK 8 7 - 199                   & 1 - 201A (6 x 26) 2 3 n/a TL Baldwin-Pacific Short Cylindrical X 45 (Iron) (Air) (Gerald M. Best ??) X "    "    "    "    " Barawik Catalog - Summer1926 - Complete Kit X Kit: One Pacific "Ranger" # 30 Oscillator Coupler, three Pacific "Ranger" # 25 Intermediate Frequency Transformers, and one Pacific # 20 "Ranger" Filter Transformer.  $15.  I believe the case is shielded as there is a reference to a shielded case in the article for the "Baldwin Pacific - Best" radio. By Aug '24, the label on top of the IF can was rectangular. Known as "Pacific Ranger" and also as the "Pacific Quintet".  45KC IFs . The last tube socket is for a 201A.
      "    "    "    "    " "    "    "    "    "    "    " Pacific Rainbow Super Het    February 1926 K                     PR - February 1926 - P187 - Kit Reference   Pacific Rainbow in PR, Feb '26, P187: Referenced in "What’s New...Apparatus Approved by Popular Radio". 
  X Baldwin-Pacific - Best n / a  Best Modified Superheterodyne Shielded Model X (Fall 1925) BK 7 7 - 199 10 x 21 3 2 1 - V W Remler Cylindrical X 45 Iron Air Gerald M. Best X "    "    "    "    "    "    "    " RN - Note 21 X RN - Note 21 X Three-dial Super.  See Note 21. "All Wave". Used UV199s.Completely brass shielded. Could have General Radio 271, Jefferson 150, Silver Marshall 60 KC, Baldwin-Pacific Shielded IFs. Remler NOT mentioned! I believe the case is shielded as there is a reference to a shielded case in the article for the "Baldwin Pacific - Best" radio. But, Best mentioned in the article that the IF should be between 40 and 50 KC, which, at 45 KC, would be perfect for the Remler IFs. Maybe didn't want to create conflict of interest. Sub-panel is 16 gauge brass and is 7x16. Brass shields were used to sepaarate various sections of the radio inside the case.  Adapted to a long wire outdoor antenna. A hand-wound "loading coil" was used to compensate for various lengths of antenna wire starting at 75 feet.
  X Baldwin Pacific - Brush n / a Kodak Size Midget 45 K.C. Best Super X Spring 1925 BK 7 7 - 199 5 3/4 x 11 2 4 1 - V TL or W Baldwin-Pacific Short Cylindrical X 45 NIF NIF Gerald M. Best X W. P. Brush, Designer San Francisco RR - October 1925 - P11 - Lite Construction   RR - October 1925 - P13   "Radio" magazine for 1925 (Month unknown, "First part of this year") has full construction article by Clinton Osborne. RR, May '25, list numerous brands of IFs for use in this radio. They must all be near 45 K.C.: Remler, All-American, Baldwin Pacific, Branston, Jefferson, Phenix, Receptrad, Silver-Marshall.  RR, Oct '25: Construction of untuned & tuned 45 KC IFs shown. Same construction info, woodcut pictures, and scheme in RN, "Superheterodyne" book. Operated on tuned loop, but there is a schematic of an adapter for use with a long wire antenna in RN, "Superheterodyne" book. See Note 21. Super small: 7 1/2 pounds sans batteries.
    Baldwin Pacific - Hall n / a Compact Super-Heterodyne   April 1925 BK 8   Baldwin-Pacific Short Cylindrical   45 NIF NIF D. J. Hall RN - April 1925 - P1880 - Construction   RN - April 1925 - P1881   The pictures in the article are copyrighted by Baldwin Pacific. Article shows three different portables using the same schematic. Called a "knockdown" in RTD, Aug '25. (Knockdowns were outlawed by the RCA decision in 1924-Ed.)  See Baldwin Pacific.
    Band-Isolator   Band-Isolator   June 1929 CB 5 7 x 24 S. Gordon Taylor New York City RN - July 1929 - P1105 RN - June 1929 - P1107 - ?? Original preview article in RN, June 29 - Page 1105.     7x24 inch panel.
    Barawik Co. Barawik Co. High Grade Eight Super-Heterodyne   July 1924 P 8   Columbia ?? Chicago RN - July 1924 - P143 - Complete / Parts / Blue Prints Part supplier.
    Bongart n / a Four Tube Super-Heterodyne   July 1924 CK 4           B. J. Bongart       New York City     RWI - July 26, 1924 - P?? - Construction   RWI - July 26, 1924 - P?? See RWI "Four Tube Super" below. Might be the same.
      "    "    " "    " Four Tube Super-Heterodyne   September 12, 1925 B 4                   "    "    "    "    "         RWI - September 12 1925 - P19 - Scheme & Parts X This is a reflexed Super using a crystal detector ahead of the audios.  Home-wound coils with factory audio used in the reflexing. This might be the B. J. Bongart Four Tube Super of July 1924 above.
  X Boone Boone Corporation,  J. T.    Super Heterodyne Transformer Kit X August 1924 K n / a n / a n / a n / a n / a n / a n / a Boone Cylindrical X 36 Air Air John T. Boone Detroit RDI - September 20, 1924 - P13 - Kit / Book X Boone Sales Booklet - 1924 - No Construction Info X Have brochure. Had "1-short wave RF Transformer, 1-Oscillator Coil, 1-Filter Coil or Input transformer which is fully balanced with the three Long Wave RF Transformers, 1-Audio Frequency Transformer, Complete Wiring Diagrams and Instructions accompanying each kit, and carefully followed, satisfactory results are guaranteed. Price $50....".  Sixty-four page technical book was called "The Super Heterodyne".  IF peaks at 36 KC, [WOW] 8666 meters. Filter transformer has primary bridged with a .0005 MFD fixed mica capacitor.  The cylindrical portion of the transformer sase is of "impregnated dark red fibre" and the terminals are of "brushed brass finished with gold instrument lacquer".  Top and bottom of case are Radion (bakelite) except the audio case has only the top of black Radion..  Also lists the Boone 3' & 2' Loop antenna. Says will bring in coast to coast on a 3 foot loop.  The Oscillator Coil is unique in design as it's a long, thin cylindrical piece. This company also made their own audio transformers.Kit price was $50.  Addressed at 3460 East Jefferson Street.  
  X   "    " "    "    "    "    "    "    "    " Eight Tube Super Heterodyne X August 1924 B 9 7 - 201A (7 x 36) 2 8 1 -V                   & 1 - MA TL Boone Cylindrical X 36 Air Air John T. Boone "    "    " RDI - September 20, 1924 - P13 - Kit / Book X Boone Sales Booklet - 1924 - No Construction Info X Have brochure. First ad shown Radio, August 1924 - P46. From ad in RDI, Sept 20, '24 (P13) has 9 (!) filament controls across the panel with two meters. Has "1-short wave RF Transformer, 1-Oscillator Coil, 1-Filter Coil or Input transformer which is fully balanced with the three Long Wave RF Transformers, 1-Audio Frequency Transformer.  IF peaks at 36 KC, [WOW] 8666 meters. Also lists the Boone 3' & 2' Loop antenna. Says will bring in coast to coast on a 3 foot loop.   Addressed at 3460 East Jefferson Street.  No panel size given, but likely 7x36 inch; huge!
  X   "    " "    "    "    "    "    "    "    " Seven Tube Super Heterodyne X February 1926 B 7 199 7 x 18 2 2 N TL Boone Cylindrical X (36) Air Air John T. Boone "    "    " Another kit reference in  PR, Feb '26, P187: Referenced in "What’s New...Apparatus Approved by Popular Radio".   Likely this radio is the same as Allen Jochum's. From Allen Jochem of Quincy, IL, email 2/02:  "It is a chassis only. Used 8 uv199's about the size of the Apex Microdyne. [X] The set does not have a name on it, but is otherwise engraved." Note the different shape at the bottom and rounded top of these transformer cans now of all metal construction. In the middle of the set are two large spiderweb coils, maybe for the oscillator circuit.  Engraved, but no name 7x18 inch panel.
  X Branston Branston, Chas. A. Branston Transformer Kit No.R-99 X March 1924 K n / a n / a n / a n / a n / a n / a n / a Branston Cylindrical X 57 (Iron) Air Buffalo, N. Y. PR - March 1924 - P60 - Kit X QST - December 1924 - P9 - Transformer "R-91" only RB - Mar 1924 for ad announcing Super kit: "R-90 Oscillator Coupler, R-91 IFs, R-92 Special Transfer Coupler for last stage of IFs, and R-93 Specially Designed Coupler for using antenna."   Oscillator Coupler is bank wound.  Transformer "R-91" peaks at 5300 meters according to QST, Dec 1924 (X). Ad in RN, June 1924, said the R-92 Special Transfer Coupler could go before or after the IFs. Also, Ad in RDI, March 22, '24, P27.  PR (& RB) April '24 P24 (& Back Pages) shows IF & coils nicely.  RB - March 1925 - P958 - Complete / Kit.   Address: 811 or 817 or 837 or 841 Main Street, listed in various ads over the year it was advertised.
  X   "    "    "  "    "    "    "    "    " Branston R-95 Super-Heterodyne Knockdown ^ PNF (March) 1924 ^ KD 7 7 - 199 (8 x 24) 2 4 (1 - V        optional) L or W Branston Cylindrical X 57 (Iron) Air "    "    "    " This is a Knockdown ^.  Refernced in the RCA set book [later, McMahan Directory].  "Knockdown" still listed in RTD, Aug '25.  Knockdown kits were made illegal with the RCA court decision of late 1924. They could not be offered, but assuming Branston had it out in March of 1924 before the decision. No other info available.
  X   "    "    "  "    "    "    "    "    " Branston R-99 Super-Heterodyne  X March 1924 B 7 7 - 199 (8 x 24) 2 4 (1 - V        optional) L or W Branston Cylindrical X 57 (Iron) Air "    "    "    "  RJ - March 1924 - P145 - Kit  Good ads in PR, June '24, P65. and RN - August '24, P??  RN - May '24 - P1618 shows "R-90 Oscillation Coil", "R-91 IF", "R-92 Transfer Coupler for Last Stage IF", & "R-93 Special Coupler for Using Antenna". Ad tells of book: "Super Heterodyne Construction" for a dolllar.   "Knockdown" still listed in RTD, Aug '25. See Ultradyne - Branston below.
  X   "    "    "  "    "    "    "    "    "  Branston Transformer Kit No. R-199 X November 1924 K n / a 7 - 199 n / a n / a n / a n / a n / a Branston Misc X (57) Iron Air "    "    "    " CRCB - Fall 1924 - P39 - Kit / Parts X Branston R-199 Brochure (1924) X Branston brochure (undated) says it is a Reflexed Super. "...reduced the number of tubes to seven UV199's or UV201A and to diminish the size of the required panel to 7" X 21 inches". "Works like ten."  The kit offered is: 3 IF matched transformers in one unit [R-200], one IF tuned transformer [R-201] for first or last stage next to the IF unit, one Shortwave unit [R-202], one Special Tuned RF Coupler unit, I believe, for reflexing [R-203], one double unit Audio Transformers [R-204].  There is a stand alone single IF transformer [R-205], also.  The IFs are of laminated silicone steel. The cases are designed to keep the leads short. These are the same basic shaped IF transformers as used in the Como Super-Het, but have different side connectors! (Comos are actually General Radio 271 IFs.)  Good ad in RB Nov '24, P16 & RN Nov '24. Sears catalogue shows the kit at $29.95 in 1925. Set shown in PR, March '25, P118 (partially assembled & called the "Accessory Kit") and also in American Radio catalogue April 1925. RN for Dec '24 (P1101) lists "Kit". RB Dec '24, P323 shows good parts layout. RB - Jan '24 - P592 Shows front panel. Two vertical rheostats shown. Brand still shown in Barawik cat. for early 1926. 7x21 inch panel.
  X   "    "    "  "    "    "    "    "    " Branston R-199 Reflexed Super-Heterodyne  X November 1924 B 7 7 - 199 or 201A 7 x 21 2 2 N L Branston Misc X (57) Iron Air "    "    "    " RN - November 1924 - Kit / Parts X CRCB - Spring 1925 (Vol 6 #1) - P58 - Lite Construction X CRCB - Spring 1925 - P60 - Layout Only Pictures from Australia.   RN, April '25, P2000, says Kit Number R-199 [$35] has the coils and Kit R-199A [$50] has all the other parts to complete the entire radio. I believe CRCB, Spring 1925 (Vol 6 #1) P98 shows the schematic for this set.  "...reduced the number of tubes to seven UV199's or UV201A and to diminish the size of the required panel to 7" X 21 inches". The kit offered is: 3 IF matched transformers in one unit [R-200], one IF tuned transformer [R-201] for first or last stage next to the IF unit, one Shortwave unit [R-202], one Special Tuned RF Coupler unit, I believe, for reflexing [R-203], one double unit Audio Transformers [R-204].  There is a stand alone single IF transformer [R-205], also.  The IFs are of laminated silicone steel. The cases are designed to keep the leads short. These are the same shaped IF transformers as used in the Como Super-Het!  Good ad in RB Nov '24, P16.  Sears catalogue shows the kit at $29.95 in 1925. Set shown in PR, March '25, P118 (partially assembled & called the "Accessory Kit") and also in American Radio catalogue April 1925. RN for Dec '24 (P1101) lists "Kit". RB Dec '24, P323 shows good parts layout. RB - Jan '24 - P592 Shows front panel. Two vertical rheostats shown. Brand still shown in Barawik cat. for early 1926. Kit reference in PR - Feb '26 - P 187 - "Apparatus Approved…"
  X   "    "    "  "    "    "    "    "    " Branston R-199 Non-Reflexed Super-Heterodyne  PNF November 1924 B 7 7 - 199 or 201A 7 x 21 2 2 N L Branston Misc X (57) Iron Air "    "    "    " RN - November 1924 - Kit / Parts X X Ads say several different Super Heterodynes can be made from the R199 kit. Likely one would be a non-reflexed set.  No other info available.
  X Branston - Brush n / a Kodak Size Midget 45 K.C. Best Super X Spring 1925 BK 7 7 - 199 5 3/4 x 11 2 4 1 - V TL or W Branston Cylindrical X 57 (Iron) Air Gerald M. Best X W. P. Brush, Designer San Francisco RR - October 1925 - P11 - Lite Construction   RR - October 1925 - P13   "Radio" magazine for 1925 (Month unknown, "First part of this year") has full construction article by Clinton Osborne. RR, May '25, list numerous brands of IFs for use in this radio. They must all be near 45 K.C.: Remler, All-American, Baldwin Pacific, Branston, Jefferson, Phenix, Receptrad, Silver-Marshall.  RR, Oct '25: Construction of untuned & tuned 45 KC IFs shown. Same construction info, woodcut pictures, and scheme in RN, "Superheterodyne" book. Operated on tuned loop, but there is a schematic of an adapter for use with a long wire antenna in RN, "Superheterodyne" book. See Note 21. Super small: 7 1/2 pounds sans batteries.
  X Branston - Ultradyne n / a Branston R-99 Ultradyne X March 1924 B 7 7 - 201A 7 x 30 2 4 (1 - V        optional) L or W Branston Cylindrical X 57 (Iron) Air "    "    "    "  RJ - March 1924 - P145 - Kit  This kit was designed to be used with the Ultradyne circuit. Good ads in PR, June '24, P65. and RN - August '24, P??  RN - May '24 - P1618 shows "R-90 Oscillation Coil", "R-91 IF", "R-92 Transfer Coupler for Last Stage IF", & "R-93 Special Coupler for Using Antenna". Ad tells of book: "Super Heterodyne Construction" for a dolllar.  See Branston.
    Braxton-King Mississippi Valley Radio Company Standard Air-core and Hi-Mu Coils ??   Fall 1925 P n / a n / a Mississippi Valley           Radio Company   St. Louis "The Radio Dealer Year Book" - See Note 27  Company advertised standard air-core and Hi-Mu coils in Fall 1925. See Note 27.  Address: 914 Pine Street.
      "    "    "    "   "    "    "    "    "    "    "    "    "    "    "    " (Screen Grid Superheterodyne)   1927 K   "    "    "    "    "    "   "    "    "                            "Season 1925-1926", Copyright 1925 Reference to company's first screen grid set CRCB - Sept '29 - P139.
      "    "    "    "   "    "    "    "    "    "    "    "    "    "    "    " Braxton-King Shielded, Plug-In IFs   December 1927 P n / a n / a   "    "    "    "    "    " Cylindrical   Air Air "    "    " RWI - December 3, 1927 - P30 Cylinder is 2 1/2 inches high and 1 1/2 inches wide.  "Plugs into any UX socket.  Sharply peaked and laboratory-matched in sets. No filter necessary. Set of four, $18.00".
      "    "    "    "   "    "    "    "    "    "    "    "    "    "    "    " Braxton-King Shield Grid Eight   November 1928 K 8   "    "    "    "    "    " "    "    "   "    "    " CRCB -  November 1928 - P169 - Complete / Kit tunable IFs. Set of four $25.
  X   "    "    "    "   "    "    "    "    "    "    "    "    "    "    "    " Braxton-King Shield Grid Eight Conversion X March 1929 CB 8 Screen Grid (8 x 24) 2 - Drum 2 N     "    "    "    "    "    " "    "    " X "    "    " CRCB - March 1929 - Custom Build Conversions X Individual Tunable IFs. "One spot reception." "No oscillation." Set of four $25. These were used during the rebuilding of a customers present Superhet, converting it to the B-K SG Super.
      "    "    "    "   "    "    "    "    "    "    "    "    "    "    "    " Screen Grid A. C. Superheterodyne   September 1929 K   "    "    "    "    "    " "    "    "   "    "    " CRCB - September 1929 - P139 - Completely Wired Ad explains "$135 Completely Wired".  I believe they have a Custom-Builder put it together.  Push-Pull 245s Power Supply $55.
      "    "    "    "   "    "    "    "    "    "    "    "    "    "    "    " Braxton-King Model A   November 1929 K 9   "    "    "    "    "    "   "    "    " CRCB - November 1929 - P45 - Complete CRCB - November 1929 - P65 CRCB - November 1929 - P66 Receiver    This is the last Braxton-King in the decade: The Improved Braxton-King Model C-5 Tuner with 5 Screen Grid tubes and 5 Tunable IF Transformers was offered Nov. 1930 per CRCB (Vol. 11, No. 4) for Nov. 1930.
      "    "    "    "   "    "    "    "    "    "    "    "    "    "    "    " Braxton-King Model B Tuner Unit   November 1929 P 5 [Tuner]   "    "    "    "    "    "   "    "    " CRCB - November 1929 - P45 - Complete CRCB - November 1929 - P65 CRCB - November 1929 - P66 RF tuner only
  X Bremer Tully Bremer Tully Mfg. Co. B-T Oscillator Coupler X June 1924 P n / a n / a n / a n / a n / a n / a n / a Bremer Tulley n/a n / a n / a n / a n / a Chicago RN - June 1924 - P1858 - Coupler Only X Ad says "Transformers for Super-Heterodyne ready July 1st."  Address: Cahal & Harrison Streets.
  X   "    "    "    "  "    "    "    "    "    "    "    " B-T Super-Heterodyne Transformer Kit X July 1, 1924 P NIF NIF NIF NIF NIF NIF NIF Bremer Tulley NIF PNF NIF NIF NIF         "    "    " RN - June 1924 - P1858 - Reference to Transformers X         June 1924 RN ad says "Transformers for Super-Heterodyne ready July 1st."  Likely with the numerous law suits RCA was bringing about at that time, B-T decided to not introduce their kit. No other information has been found. 
  37      78 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
  X Brunswick Brunswick Balke Collender Co. & Radio Corporation Of America Beaux Art Radio / Phono Combination ^^ PNF October 1924 ^^ M NIF NIF NIF NIF NIF NIF NIF NIF NIF PNF NIF NIF NIF         Chicago & Camden, N. J.             (No further information)
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Tudor Model 160  [Radiola / Phono Combination] ^^ X October 1924 ^^ M 6 6 - 199 Model 813            Six Tube Panel 2 2 1 - Optional Internal   Loop R.C.A.  6 Tube Reflexed Catacomb X 60 Air n / a Edwin H. Armstrong            & Harry Houck X "    "    "    "    "    "    "    " Brunswick Brochure - Manufactured X Rider - Brunswick P1-1 & 1-2 - Catacomb & Wiring X Reflexed Super Het ^. Used 6 tube Superheterodyne with "UV Catacomb".  No untuned, 1 tuned, 3 IFs, 2 Audio ^.  Radio/Phono combo ^.  $550.00 ^^.  Left hand radio panel.
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Hudson Model BR-260  [Radio / Phono Combination] ^^ X October 1924 ^^ M 6 6 - 199 Model 813            Six Tube Panel 2 2 1 - Optional Internal   Loop R.C.A.  6 Tube Reflexed Catacomb X 60 Air n / a Edwin H. Armstrong            & Harry Houck X "    "    "    "    "    "    "    " Reflexed Super Het ^. Used 6 tube Superheterodyne with "UV Catacomb". No untuned, 1 tuned, 3 IFs, 2 Audio ^.  Radio/Phono combo ^.  $600.00 ^^.  Radio in a drawer
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Empire Model 360  [Radio / Phono Combination] ^^ X October 1924 ^^ M 6 6 - 199 Model 813            Six Tube Panel 2 2 1 - Optional Internal   Loop R.C.A.  6 Tube Reflexed Catacomb X 60 Air n / a Edwin H. Armstrong            & Harry Houck X "    "    "    "    "    "    "    " Ladies Home Journal - April 1925 - Ad X Reflexed Super Het ^. Used 6 tube Superheterodyne with "UV Catacomb". No untuned, 1 tuned, 3 IFs, 2 Audio ^.  Radio/Phono combo ^.  $650.00 ^^.  Radio in a drawer
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model 60  [Radio / Phono Combination] ^ X 1925 ^ M 6 6 - 199 Model 813            Six Tube Panel 2 2 1 - Optional Internal   Loop R.C.A.  6 Tube Reflexed Catacomb X 60 Air n / a Edwin H. Armstrong            & Harry Houck X "    "    "    "    "    "    "    " Brunswick Brochure - Manufactured X Rider - Brunswick P1-1 & 1-2 - Catacomb & Wiring X Reflexed Super Het ^. Used 6 tube Superheterodyne with "UV Catacomb". No untuned, 1 tuned, 3 IFs, 2 Audio ^.  Radio/Phono combo ^.  Left hand radio panel.
      "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model 460  [Radio / Phono Combination] ^   1925 ^ M 6 6 - 199 Model 813            Six Tube Panel 2 2 1 - Optional Internal   Loop R.C.A.  6 Tube Reflexed Catacomb X 60 Air n / a Edwin H. Armstrong            & Harry Houck X "    "    "    "    "    "    "    " Reflexed Super Het ^. Used 6 tube Superheterodyne with "UV Catacomb". No untuned, 1 tuned, 3 IFs, 2 Audio ^.  Radio/Phono combo ^.
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Panatrope Model PR-148-C  [Radiola / Phono Combination] X 1926 ^ M 6 6 - 199 Model 813            Six Tube Panel 2 2 1 - Optional Internal   Loop R.C.A.  6 Tube Reflexed Catacomb X 60 Air n / a Edwin H. Armstrong            & Harry Houck X "    "    "    "    "    "    "    " Brunswick Catalogue - Dated for 1927 Models - Manufactured X Rider - Brunswick P1-1 & 1-2 - Catacomb & Wiring X Reflexed Super Het^. Used 6 tube Superheterodyne with "UV Catacomb".  No untuned, 1 tuned, 3 IFs, 2 Audio.  Radio/Phono combo.  Combos "from $250 to $2250"
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Panatrope Model PR-148-C  [Radiola / Phono Combination] X 1926 ^ M 7 [+ 1] (199 & 171) Radiola 28           Seven                Tube Panel 2 - Drum 2 1 - Optional Internal   Loop R.C.A. 7 Tube Catacomb X 60 Air n / a Edwin H. Armstrong X "    "    "    "    "    "    "    " Brunswick Catalogue - Dated for 1927 Models - Manufactured X RCA Radiola 28 used a flat panel. No untuned, 1 tuned, 2 IFs, 2 Audio ^.  Panatrope catalogue, 1927, $1275. Combos "from $250 to $2250"
      "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Cordova 8 - 2D [Dry Battery]  [Radiola / Phono Combination] ^   November 1926 M 7 [+ 1] (199 & 171) Radiola 28           Seven                Tube Panel 2 - Drum 2 1 - Optional Internal   Loop R.C.A. 7 Tube Catacomb X 60 Air n / a Edwin H. Armstrong X "    "    "    "    "    "    "    " Rider - Brunswick P1-7 - Wiring X RCA Radiola 28 used a flat panel.  No untuned, 1 tuned, 2 IFs, 2 Audio ^ ??.  Radio/Phono combo ^.
      "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Cordova 6  [Radiola / Phono Combination] ^   January 1927 M 6 6 - 199 Model 813            Six Tube Panel 2 2 1 - Optional Internal   Loop R.C.A.  6 Tube Reflexed Catacomb X 60 Air n / a Edwin H. Armstrong            & Harry Houck X "    "    "    "    "    "    "    " Rider - Brunswick P1-5 - Wiring X Reflexed Super Het ^. Used 6 tube Superheterodyne with "UV Catacomb". No untuned, 1 tuned, 3 IFs, 2 Audio ^ ??.  Radio/Phono combo ^.
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Cordova 8  [Radiola / Phono Combination] ^ X January 1927 M 8 (199 & 171) Eight                 Tube Panel 2 - Drum 2 1 - Optional Internal   Loop R.C.A. 8 Tube Catacomb X 60 Air n / a Edwin H. Armstrong X "    "    "    "    "    "    "    " Rider - Brunswick P1-6 - Wiring X RCA Radiola 28 used a flat panel. No untuned, 1 tuned, 2 IFs, 2 Audio ^ ??.  Radio/Phono combo.
      "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model BR 18   January 1927 M 7 [+ 1] (199 & 171) Radiola 28           Seven                Tube Panel 2 - Drum 2 1 - Optional Internal   Loop R.C.A. 7 Tube Catacomb X 60 Air n / a Edwin H. Armstrong X "    "    "    "    "    "    "    " Riders wiring harness diagram.  Looks like Radiola 28.
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Panatrope Model PR-138-C  [Radiola / Phono Combination] X December 1927 M 7 [+ 1] (199 & 171) Radiola 28           Seven                Tube Panel 2 - Drum 2 1 - Optional Internal   Loop R.C.A. 7 Tube Catacomb X 60 Air n / a Edwin H. Armstrong X "    "    "    "    "    "    "    " Radio Broadcast - December 1927 - P?? - Manufactured X RCA Radiola 28 used a flat panel. No untuned, 1 tuned, 2 IFs, 2 Audio ^.  Radio - Phonograph combo ^.  Exclusively used RCA Radiola chassis after 1926 ^.  (Note 12:) An agreement produced Super-Het phono panels for several Brunswick and RCA combinations. Brunswick cat: $1150
      "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model 3NC8 [A-C]  Highboy ^   October 1928 M 8 [+ 1 A-C] Y227, 171, 280 Walnut 1 - Drum 1 n / a Short Indoor R.C.A. Under Chassis Rectangle X 180 KC (Air) n / a "    "    "    "    "    "    "    " Rider - Brunswick P3-2 - Chassis & Trimmers X One untuned coupling stage, 1 stage of tuned RF, 1 tuned detector stage, 2 IF stages, second [power] detector, and 1 audio stage. Used one UX280 full-wave tube in the power supply.  High-Boy cabinet ^. $700.00 ^.
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model 5NO [A-C]  Table Model X October 1928 M 8 [+ 1 A-C] Y227, 171, 280 Walnut 1 - Drum 1 n / a Short Indoor R.C.A. Under Chassis Rectangle X 180 KC (Air) n / a "    "    "    "    "    "    "    " Rider - Brunswick P3-2 & 1-15 - Chassis & Scheme X Same as RCAs Model 60. One untuned coupling stage, 1 stage of tuned RF, 1 tuned detector stage, 2 IF stages, second [power] detector, and 1 audio stage. Used one UX280 full-wave tube in the power supply. Table model ^. $175.00 ^.   
      "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model 5WO [A-C]  Table Model X   M 8 [+ 1 A-C] Y227, 171, 280 Walnut 1 - Drum 1 n / a Short Indoor R.C.A. Under Chassis Rectangle X 180 KC (Air) n / a "    "    "    "    "    "    "    " Looks the same as Brunswick 5NO and RCAs Model 60. Assume it has one untuned coupling stage, 1 stage of tuned RF, 1 tuned detector stage, 2 IF stages, second [power] detector, and 1 audio stage. Used one UX280 full-wave tube in the power supply. Table model. No further info found.  
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model 5NC8 [A-C]  Highboy X October 1928 M 8 [+ 1 A-C] Y227, 171, 280 Walnut 1 - Drum 1 n / a Short Indoor R.C.A. Under Chassis Rectangle X 180 KC (Air) n / a "    "    "    "    "    "    "    " Rider - Brunswick P3-2 & 1-15 - Chassis & Scheme X One untuned coupling stage, 1 stage of tuned RF, 1 tuned detector stage, 2 IF stages, second [power] detector, and 1 audio stage. Used one UX280 full-wave tube in the power supply. High-Boy cabinet ^.  $375.00 ^.
      "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model 148  [Radio / Phono Combination] ^   1928 ^ M 8 ^ (199, 171) (Eight                   Tube Panel) 2 - Drum 2 1 - Optional Internal   Loop R.C.A. (8 Tube Catacomb) X (60) Air n / a Edwin H. Armstrong X "    "    "    "    "    "    "    "   No untuned, 1 tuned, 2 IFs, 2 Audio ^. Battery-operated Radio/Phono combo ^. $995.00 ^.
  X   "    "    " "    "    "    "    "    "    "    "    "    "   "    "    "    " Model 3NW8 [A-C]  Highboy   January 1929 M 8 [+ 2  A-C] Y227, 250, 281 Walnut 1 - Drum 1 n / a Short Indoor R.C.A. Under Chassis Rectangle X 180 KC (Air) n / a "    "    "    "    "    "    "    " Rider - Brunswick P3-2 & 1-15 - Chassis & Scheme X One untuned coupling stage, 1 stage of tuned RF, 1 tuned detector stage, 2 IF stages, second [power] detector, and 1 audio stage. Used two UX281 half-wave tubes in the power supply. High-Boy cabinet ^. $595.00 ^.
  X Bryant n / a Homebuilder's Seven - A Super Set X April 1929 B 7 201A, 171 for DC or 227, 222, 171 for AC 7 x 24 2 - Drum 1 N W Homemade Upright Coils X 214 Air n / a B. B. Bryant NIF RN - April 1929 - P924 - Construction X RN - April 1929 - P928 - Scheme, Layout & Parts X Article also shows how to apply AC to the circuit.
    Brinkman n / a Three Level Super-Heterodyne   May 1924 B 12 Henry Brinkman Pelham, N. Y. RA - May 1924 - P26 & P36 - Pictures / Captions Unique multi-level set. Two stages of RF, three stages of IF, and Push-Pull audio. Also shows Mrs. Brinkman & huge commercial antenna. See St. James 1927 "Upright 8". Looks like a copy. 
    Brunn n / a A Choice Superheterodyne   January 1927 CB Brunsten Brunn (RW - January 8, 1927 - P?? - ??)  
    Brush n / a Six Tube Het-Duo-Gen   December 1924 CB C. E. Brush Chicago RDI - December 28, 1924 - P?? - Construction RDI - December 28, 1924 - P?? Layout in RDI, Jan. 3, '25, P20. 7x26 inch panel.
    BSM NIF BSM Super 8 X (1926) NIF 8 NIF NIF NIF NIF NIF   NIF NIF PNF NIF NIF NIF NIF This set was up for auction opn eBay in a group of other radios, several from the mid-20s. Nothing else is know at this time [1/5/07].
  X Buell Buell Manufacturing Company Flewelling Uniformer X May 1924 P n / a n / a n / a n / a n / a n / a n / a Buell Module X NIF (Air) (Air) Edmond T. Flewelling Chicago CRCB - Fall 1924 - Parts X Flewelling Uniformers were designed of polished hard rubber with terminals protruding from the top. The Uniformer block has recessed areas on the top so the Flewelling tube socket can be attached to two terminals on one block and the other two terminals on another to build a compact arrangement of IFs and sockets.  Ad says a six-tube set can be as small as 19 inches and 3 1/2 inches deep. Located on 2975-77 Cottage Grove Avenue, Chicago.
  X Buell - Flewelling Eight "    "    "    "    "    "    "    "    "    " Flewelling 8 X January 28,1928 B 8 201A, 171 (7 x 24) 2 2 N TL Buell Module X NIF (Air) (Air) Edmond T. Flewelling       Chicago     New York Sun - Radio Section                                             January 28, 1928 - Front Cover - Lite Construction X New York Sun - Radio Section                                             January 28, 1928 - Front Cover                                  Scheme, Layout, & Parts X "By the use of a novel capacity strip the assembly of this Super is simplified and the operating characteristics are improved."  Four Flewelling IFs, One Flewelling TRF transformer, and two Flewelling audios. Special capacitive strip used under the sub-panel which connects tube sockets and other components to a common point. Special hookup: Second detector grid condenser mounted across primary of first audio transformer. Trademark on top of each transformer. Used seven 201As and a 171A in the final audio stage. The four Flewelling IFs run across back of subpanel. Also see Buell for Flewelling.
  26        104 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
  X Camfield Camfield Radio Manufacturing Company Super Selective Nine X March 1927 CK 9  [5 ******] 201A,           200A, & 112 7 x 30 3 2 N S & L W Rusco No. 95 IFs & Rusco Band Pass Filter  Vertical Tuna Can / Module X 95 Air Air         Chicago CRCB - September 1927 - P195 - Kit / Parts X RLG - September 1927 - P81 - Construction X RLG - September 1927 - P84 - Scheme X This is a three-dial set!  Also CRCB Sept '27. Switchable 5 tube, two dial TRF to 9 tube Super Het. Two "Rusco" IFs &one Band Pass Filter. Used Silver-Marshall 220 audiotransformers.  Used two Camfield single variable condenser and one two-ganged variable condenser. Had six CECO 201As, two CECO 200A detector tubes, and one 112 Power tube. Had three Camfield "Duo-Formers". Camfield advertised non-Super parts in RN, Nov '25, P733.  Full page ad in S. Hammer Radio Co. [P10].  [First complete radio, non-Super "Duodyne" in Radio, Feb '26.]  CRCB for March 1927 for more construction, layout, wiring diagram, & scheme.  In November 1927, American Auto & Radio advertised complete set with tubes and cabinet for $140.75.  The complete kit was $74.82.  7x30 inch panel. 
      "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Super Selective Ten   November 1927 CK 10 [6******]   3 2 N   Rusco No. 95 IFs & Rusco Band Pass Filter  Vertical Tuna Can / Module   95 Air Air "    "    " CRCB - November 1927 - P245 - Complete / Kit CRCB - November 1927 - P157 - Construction CRCB - November 1927 - P157 ****** - This is a three-dial set!  Switchable from 6 tube TRF to 10 tube Super Het. Used Tyrman IFs & parts.
      "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Super Selective Nine 'Revised'   January 1928 CK [9  [5 ******])   3 2 N S & L W Rusco No. 95 IFs & Rusco Band Pass Filter  Vertical Tuna Can / Module 95 Air Air "    "    " [Note 9] (This is a three-dial set!)
    Carborundum Company Carborundum Company Carborundum Superheterodyne   January 1927 CB 8 [+ 1] * 3 Madison or Victoreen Suggested Tuna Can 150 Dr. M. L. Hartmann & John R. Meagher, developers*** Niagara Falls, N. Y. RN - January 1927 - P824 - Construction RN - January 1927 - P824 - Layout Three-dial set *.   Used one Carborundum detector in place of the second detector tube. Three tuning dials, 150 K. C. IFs, & generally just unorthodox!  Used one stage of neutralized, tuned radio frequency, a regenerative vacuum tube first detector, three IFs at 2000 meters [150 KC], one Carborundum second detector, and two audio stages. Used either Madison Radio Corp. or Victoreen IFs.  Madison IFs shown [Not Madison Moore].  Hartmann was Research Director for the Carborundum Co and Meagher was their Radio Research Engineer.
  X CELCO Central Engineering Laboratories    Celco Double "D" Coil IFs   August 1925 P n / a n / a n / a n / a n / a n / a n / a Central Engineering Laboratories    Tuna Can X 66 ?? Air Air Chicago PR - October 1925 - Parts X Good ad in RTD, Aug '25.  This is quite some honey with "Double Ds"!!
  X Columbia Columbia Radio Corporation New Columbia IFs, Oscillator Coupler, and Audios X Fall 1924 K n / a n / a n / a n / a n / a n / a n / a Columbia Misc X 38 "Semi-iron" None Chicago Chicago Salvage Catalogue - Fall 1924 - Kit X Chicago Salvage ad of Fall 1924 shows IF and Audio and says: Peaks at 7800 meters [38 KC] with voltage "amplification factor of 37 at its peak". Highest of any on the market.  "A complete set of these Transformers consisting of an Oscillator Coupler ($3.50 list), four Long Wave Transformers ($5.00 each), an antenna coupler, and two Columbia Audio Frequency Transformers will be delivered to you in a kit ready to build your Super-Heterodyne for a net price of $36.25." "No filter is required for this Transformer." Used in Randolph sets. Ad in CRCB, Fall 1924, P196, Parts.  Also see Ultradyne L-1 (Columbia) below.  Address 155 N. Union St. in RTD, FEb '25.
  X   "    "    " "    "    "    "    "    "    "    "    "    " Semi-Finished 8-Tube Super-Heterodyne X August 1925 CK 8 8 - 201A 7 x 30 2 3 N TL or W Columbia Misc X 38 "Semi-iron" None "    "    "   X Randolph ad in Fall of 1926 shows $39.50. Same ad shows letter dated August 19, 1925.   Used 201As only. "...not furnish for dry cells..."  Optional antenna coupler for outside antenna increased complete kit to $42.50.  Baseboard was 10 inches deep. 7x30 inch panel. 
  X   "    "    "   "    "    "    "    "    "    "    "    "    " Semi-Finished 8-Tube Super-Heterodyne Deluxe X August 1925 CK 8 8 - 201A 7 x 30 2 5 N TL Columbia Misc X 38 "Semi-iron" None "    "    " Columbia Catalogue - Fall 1925 - P14 - Complete X Not sure what makes this a DELUXE. Columbia catalogue, Fall 1925: "Stock Number 1320. List Price $75.00. Your Price $35.50."  PR, Oct '25.  Randolph, Fall '25, P23, ad shows "Columbia IFs" and said it operated at 45 KC. Same ad shows letter dated August 19, 1925. Columbia Radio Catalogue - Fall 1925 - P14 - Complete. Loop and cabinet not included with set. 7x30 inch panel (10 inch deep cabinet). 
      "    "    " "    "    "    "    "    "    "    "    "    " (Improved 9-Tube Super  Deluxe)   1928 CK 9 201A & 112                  or 171 or 250 7 x 30 2 1 N TL or W Columbia Misc X 38 "Semi-iron" None "    "    " Hamilton Carr Catalogue - 1928 - Complete X The additional antenna coupler here for long wire or loop makes this the Deluxe model. List $90. HC price $36.40. Benjamin UX tube sockets.Used 112 or 171 in Push-Pull audio. Also could use 120 power tubes. Used Knight K200 and P-P audio transformers. Complete with mahogany cabinet $39.90. Drilled 7x30 inch panel. 
  X Columbia - Hamilton Carr "    "    "    "    "    "    "    "    "    " Semi-Finished 8-Tube Super-Heterodyne X (Fall 1926) CK 9 9 - 201A 7 x 30 2 3 N TL or W Columbia Misc X 38 "Semi-iron" None "    "    " H-C Catalogue - Late Summer 1926 - P?? X "Our Own Special Offer". Semi-Finshed. Loop antenna version only. $33.60. In mahogany cabinet $37.95.  Long-wire antenna version for $35.95 sans cabinet.  Optional long-wire antenna coupler for $3.00.  See Columbia Semi-Finshed 8-Tube above.  Baseboard was 10 inches deep. 7x30 inch panel.
  X   "    "    "    "    "    "    "    " "    "    "    "    "    "    "    "    "    " Improved 9 Tube Super X September 1927 CK 9 201A & 112                  or 171 or 250 7 x 30 2 1 N TL or W Columbia Misc X 38 "Semi-iron" None "    "    " H-C Catalogue - Late Summer 1927 - P63 "Our Own Special Offer…Thousands of Users Testify to this Wonder Kit". Used NEW Knight K2000 audio and Knight Push-Pull for use with UX112, or UX171, or UX210 tubes.  Has Camfield 620 Oscillator Coil.  Loop antenna version for $34.50.  Long-wire antenna version for $36.40.  Either version in a mahogany cabinet for $39.90   7x30 inch panel. 
  X Columbia - Randolph   "    "    "    "    "    "    "    "    "    " Semi-Finished 8-Tube Super-Heterodyne X October 1924 CK 8 8 - 201A or 199 7 x 30 2 5 N TL Columbia Misc X 38 "Semi-iron" None "    "    " PR - Randolph Radio Ad - October 1925 - P25 - Complete X Ads make it seem this is a Randolph Superhet by omission of the Columbia name except in the fine print of the parts. Used either Columbia (shown in picture) or Remler IFs.  Randolph was a parts clearing house selling cheap kits. $59.75 ^   RN - October 1924 - P509 - Complete. 7x30 inch panel.
      "    "    "    "    "    "    "    "    "    "    "    "    "    "    "    "    " Super-Heterodyne   December 1924 CK 8 Columbia Misc X 38 "Semi-iron" None "    "    " RN - December 1924 - P955 - Complete Used either Remler or Columbia (as shown in picture) IFs.  Randolph was a parts clearing house selling cheap kits. $59.75.  7x30 inch panel.  
  X   "    "    "    "    "    "    "       "    "    "    "    "    "    "    "    "    " Semi-Finished 8-Tube Super-Heterodyne Deluxe X August 1925 CK 8 8 - 201A 7 x 30 2 5 N TL Columbia Misc X 38 "Semi-iron" None "    "    " Randolph Radio Catalogue - Fall 1925 - P23 - Complete X Ads make it seem this is a Randolph Superhet by omission of the Columbia name except in the fine print of the parts.  PR, Oct '25. Randolph, Fall '25, P23, ad shows "Columbia IFs". 7x30 inch panel (10 inch deep cabinet). 
  X Columbia - Ultradyne Columbia Radio Corporationm Ultradyne L-1 Super-Het X Fall 1925 CK 8 8 - 201A 7 x 30 2 5 N Columbia Misc X 38 "Semi-iron" None "    "    " Columbia Radio Corp Catalongue - 1926 - P22 - Complete Kit X This is a Lacault Ultradyne L-1 with Columbia IFs and Columbia or Thordarson audios. RF and Oscillator coils are the original Phenix Ultradyne coils. "Stock number 4054 List Price Value, $80.00. Your Price $37.50."  Original L-1 still listed in Randolph (somehow associated with Columbia), Fall '25, P23: Complete $45.85. See Ultradyne L-1 below.  7x30 inch panel.
  X Como Como Apparatus Corporation Six-Tube Super-Heterodyne X June 1924 CK 6 6 - 199 or 201A Breadboarded No panel 2 2 N NIF Como / General Radio Misc / Module X 30 Iron Air Boston /                 Manchester, NH RB - June 1924 -Back Pages - Complete / IFs X RRET, July '25, P64: "This is a 6 tube receiver priced at $87.50. Used lots of General Radio parts.  No audio is provided; intended for "headphones only". In Summer of '24 Como in Boston. As of July 1925 in RR, Como is in Manchester, N. H.  Used 199s or 201As. Has 2 detectors, 1 oscillator, 3 stages of RF amplification. The Filter is a Como 30 KC in a black rectangular, boxy unit with two terminals high on each end.. IFs are General Radio 271, tuned to 30 KC.  Also see General Radio Transformer # 271.  Ad has complete list of parts. Address 446 Fremont St., Boston in RTD, Feb '25. In Radio Retailing, July 1925, it was located on Kelly Street, Manchester. It's 16.25x8x4 inches with 199 tubes. 
  X   "    "    " "    "    "    "    "    "    "    "    "    " Nine-Tube Super-Heterodyne   June 1924 CK 9 6 - 199 or 201A Breadboarded No panel 2 (2) N NIF Como / General Radio Misc / Module X 30 Iron Air "    "    "    "    "    " PR - July 1924 - P14 [ads]  Complete / Construction Info RRET, July '25, P61: "...designed for either VU-199 tubes or UV-201A tubes.  Push-Pull is used in the second stage of audio...Pictorial diagrams are furnished, instead of the usual blueprints, supplemented by five photographs of the complete set. The panel has all of the hole drilled ready for mounting. Intended retail prices are, in order, $125 and $130."  No untuned, no tuned, 3 IFs, 3 Audio ^.  $125.00 ^.  "10,000 meters" (30 K.C.) - "'30" Tuned Transformer" as shown in RB - Sept 1924 - P5 - Parts. As shown in PR, June '24, P56, the Filter is a Como 30 KC in a black rectangular, boxy unit with two terminals high on each end. The IFs are General Radio 271.  Also see General Radio Transformer # 271, July 1924.  $125 (199 version) or $130 (201A version). Push-Pull audio amplification. "Knockdown" still listed in RTD, Aug '25.  In Summer of '24 Como in Boston at 446 Fremont St.. As of July 1925 in RR, Como is in Manchester, N. H., located on Kelly Street.  The dimensions for the nine tuber with 199s are 24x8x4 inches. With 201A tubes it's 26.5x9.25x4.75 inches.
    Consomello Mazda Radio Manufacturing Co. Consomello   Fall 1925 M 8 8 - 201A (7 x 24) 2 2 (1 -V) W St. James Tall Red Top                Vacuum Tube X 240 Air in Vacuum Air in Vacuum Robert T. St. James Cleveland CRCB - Fall 1925 - P196 - Manufactured See St. James.  3408 Perkins Ave. $160  CRCB Summer 1926: $130. Probably 7x24 inch panel.  According to AWA article [Ohio's Radio Industry in the 1920s] by D. K. Owens on page25, Mazda's last year was 1926.  No reason why indicated. 
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " Grand   Fall 1925 M 8           "    "    " CRCB - Fall 1925 - P196 - Manufactured This set is in DOUBT ??? Might have changed this model to Super Het in mid-1925. RN? Jan 1925 shows non-Super. See St. James. Differs from set above with built-in speaker and "space for both A and B batteries".  $250. CRCB Summer 1926: $225.  Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " (Portable ^)   1926 ^ M               "    "    "  See Note 25.  $225 ^  Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " Special   Summer 1926 M               "    "    " CRCB - Summer 1926 - P??? - Manufactured See St. James.  CRCB Summer 1926: $160.  Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " (Consomello ^)   1926 ^ M 8 ^ 8 - 201A (7 x 24) 2 2 NIF W St. James Tall Red Top                Vacuum Tube X 240 Air in Vacuum Air in Vacuum Robert T. St. James "    "    " See St. James. See Note 25. $175 ^  Probably introduced Fall 1926. Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " (Deluxe ^)   1926 ^ M 8 ^ 8 - 201A (7 x 24) 2 2 NIF W St. James Tall Red Top                Vacuum Tube X 240 Air in Vacuum Air in Vacuum Robert T. St. James "    "    " See St. James. See Note 25. A console ^. $235 ^  Probably introduced Fall 1926. Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " (Grand ^)   1926 ^ M 10 ^ 10 - 201A (7 x 24) 2 2 NIF W St. James Tall Red Top                Vacuum Tube X 240 Air in Vacuum Air in Vacuum Robert T. St. James "    "    " See St. James. See Note 25. A console ^.Likely AC with 10 tubes. $500 ^  Probably introduced Fall 1926. Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " (Portable ^)   1926 ^ M               "    "    "  See Note 25.  $225 ^  Probably introduced Fall 1926. Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " (Premier ^)   1926 ^ M 8 ^ 8 - 201A (7 x 24) 2 2 NIF W St. James Tall Red Top                Vacuum Tube X 240 Air in Vacuum Air in Vacuum Robert T. St. James "    "    " See St. James. See Note 25. $175 ^  Probably introduced Fall 1926.  Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " (Royal ^)   1926 ^ M 8 ^ 8 - 201A (7 x 24) 2 2 NIF W St. James Tall Red Top                Vacuum Tube X 240 Air in Vacuum Air in Vacuum Robert T. St. James "    "    " See St. James. See Note 25. A console ^. $285 ^  Probably introduced Fall 1926. Probably 7x24 inch panel.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    " (Special ^)   1926 ^ M 10 ^ 10 - 201A (7 x 24) 2 2 NIF W St. James Tall Red Top                Vacuum Tube X 240 Air in Vacuum Air in Vacuum Robert T. St. James "    "    " See St. James. See Note 25. Likely AC with 10 tubes.  $275 ^   Probably introduced Fall 1926. Probably 7x24 inch panel.
  X Consrad Consrad Company Genuine Standard Super-Heterodyne   November 1924 BP (8) (201A) (8 x 40) 2 5 1 -V                   & 1 - MA L NIF NIF NIF NIF NIF NIF    F. F. Webb New York City RN-Nov1924-ConsradCompany-Ad-Patterns Only X Webb  [Note 6] - Ad - Scheme Pattern No. 14.  Contains two extra large blueprints 19.5 by 44 inches and a 16-page instruction book. RadioConstructor-100 Radio Hookups-FFWebb-3rdPrint-Dec1924.  RN, Dec 1924, P1108, Blue Prints.  Addressed at 233 Fulton. 
      "    "    "   "    "    "    "    "    " Consrad Strobodyne   January 1928 BP 8   11 x 27         (Radio Electric Laboratory)     120 ??     Lucien Chretien     [translated by R. E. Lacault]       "    "    "    "    " RN - January 1928 - P808           Ad's for new 16-page book about construction of the Strobodyne.  11x27 inch panel!
  X Daven Super Amplifier Daven Radio Corporation Daven Super Amplifier  X July 1925 P 3 201A n / a n / a n / a n / a n / a Daven Module / Separate Parts X n / a Resistance Coupled n / a Newark, NJ PR - July 1925 - Part X The Daven Super Amplifier is an entire bakelite unit with three tube sockets and associated resistances used as the IF stages of a Superhet. The Type 3-K was a kit without tube sockets.  Both used Daven Type MU-20 tubes. RN - March 1926 - P1373.  See Popular Mechanics magazine below and the "Eight Tube Resistance Coupled 1927 Super".
  X Dean - Receptrad Charles A. Dean Eight Tube Superheterodyne [SH8-1] X (1924) CB 8 8 - 201A 7 x 40 2 6 N L Radio Receptor Cylindrical X 100 "Comunited Iron" Air Lieut. Victor Greiff Charles A. Dean New York City Custom-built by Charles A. Dean of Binghamton, New York, likely for his personal use and not to resell.  This set has what appears to be an long wire antenna coupler behind the front panel near the center. This might explain the knife switch at the far left interior and the front panel markings that say, "Loop or Variocoupler Secondary" with arrows pointing to external binding posts at the top and bottom of the front panel. The Barry-Receptrad has this same arrangement with binding posts. The Dean appears also to have a jack between the the two binding post for a connection to a two-wire loop antenna.  The standard volt meter and the milliamp meter were not included on this Receptrad. The three headphone jacks are above the filament controls like on the Barry-Receptrad, which seems standard.  Front panel is three inches shorter than the standard early Receptrad at 39.5 inches. 8x36 inch engraved panel!  See Receptrad below.
  X DeLand DeLand Radio Manufacturing Company Famous One Spot R. F. Transformer X November 1927 P n / a n / a n / a n / a n / a n / a n / a DeLand Standing Rectangle X NIF (Air) NIF Milwaukee, Wis. CRCB - November 1927 - P223 - Parts X One Spot IF transformer only.  Address: 780 - 29thStreet.
    Domino Domino Radio Service Super- Heterodyne Kits   May 1924 K               New York City RN - May 1924 - P1699 - Kit "$55 Super Heterodyne kits with free assembly books. Only $49.50."
  X Du Bois William L. Du Bois 8-Tube Super-Heterodyne   November 1924 CK 8 NIF NIF NIF NIF NIF NIF NIF NIF PNF NIF NIF NIF NIF Philadelphia TR - November 22, 1924 - P14 - Complete Parts or Built X "Complete set of parts $45.00. Wire it yourself or we will build it for you $15.00 extra. All parts guaranteed first quality. 4529 Baltimore Avenue.  Day and night Service."
  X   "    "    " "    "    "    "    "    " Monarch 4-Tube Super-Het   February 1925 (CB) 4 NIF NIF NIF NIF NIF L NIF NIF PNF NIF NIF NIF NIF "    "    "    " TR - February 7, 1925 - P14 - Complete X "Best money can buy at a price within the reach of all. Noted for distance, selectivity and ease of tuning. No outside aerial required. $125."
    Duplex Duplex Engine Governor Co., Inc. RK Supplimentary Kit X September 1924 CK Brooklyn, N. Y. QST - January 1925 - P? - Kit "RK Supplemental Kit" also shown in RB - Sept 1924 - P455ish -Ad.  Supplimental kit has tube sockets, variable caps, rheostats, etc.
      "    " "    "    "    "    "    "    "    "    "    "    " Super-Het   January 1925 K Duplex Engineering "    "    "    "    " PR - January 1925 - P68 - Kit  
    DX Seven n / a DX Seven Super Heterodyne     CB     (7 x 21) 2 2 1 -V                   & 1 - MA                             Radio Receivers & How To Make Them   Radio Receivers & How To Make Them   "DX7 Super Het" from "Radio Receivers & How To Make Them"
   34     138 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
  X Eastern Coil Eastern Coil Corporation Eastern Pickle Bottle Coupler Model FC X January 1925 P n / a n / a n / a n / a n / a n / a n / a n / a Eight-sided                  Tuning Coil X n / a n / a A. O' Connor New York City RB - July 1925 - P3152 - Parts X RB - June / August 1925* X RB - June / August 1925* X This company at 22 Warren in NYC built self-supporting coils for various circuits, like Roberts, DX Superdyne, Browning-Drake, and typical TRFs. The Model "FC" was designed for specific use in the O'Connor "Frequency Changer" that, when set up with a five tube TRF or Neutrodyne, turns the radio into a superheterodyne. Other radios can be used, also. Model "FC" retailed at $6.00. See Radio Broadcast June & August 1925 for "Frequency-Changer" articles by A. O'Connor!  See "O' Connor" below.
    Eclipse NIF Eclipse Superheterodyne   March 1927 CB Radio mechanics - March 1927 - ???  
  X Eight-In-Line Boulderadio Eight-In-Line X September 1927 K 8 8 - 201A 7 x 24 2 2 N TL Eight-In-Line Wooden Module X 85  Air Air Boulder, CO American Radio Catalogue #117                                                      September 1927 - P51 - Eight Tube Unit X CRCB - September 1927 - P98 - Construction ? CRCB - November 1927 - P84 - Complete Scheme X "Takes the 'IF' out of putting the set together" (PUNNY)  Eight tube module [18 lbs] & a six tube unit [New 11/27]. The pre-assembled module was a wooden structure that covered the guts of the radio, leaving only the tubes and their sockets shown. Used DeJur parts as recommended. "The Gradergood Co., 1435 Welton St., Denver" is sales representative with a store, "Radio Stores Inc" next door at 1433 Welton. Ads said the company guaranteed if the unit "went sour" they'd replace [seemingly forever] if the unit hadn't taken apart or abused.  RN, Jan '27, P788, article & scheme [no internal values give]. A complete 8 tube schematic is shown on page 84 of the Nov 1927  S. Hammer Radio Co. offered completely wired version in Corbett cabinet for $156 in Sept '27. CRCB, Sept. '27, P172 & 173, two page ad.  American Radio, Sept '27, offered the unit for $63.00 [retail $105.00] and the complete kit without cabinet, batteries, and tubes for $75.84 [retail $ 126.00] .
  X   "    "    "   "   "    "    "   " Six Tube Unit of the Eight-In-Line X November 1927 K 6 6 - 201A 7 x 24 2 2 N TL Eight-In-Line Wooden Module X 85  Air Air "    "    "    " CRCB - November 1927 - P53 - Six Tube Unit X CRCB - November 1927 - P82 - Hookups X CRCB - November 1927 - P84 - Complete Scheme X See Eight-In-Line above. Add two or three stages of power audio to this Unit to make it a complete 8-9 tube superhet. The pre-assembled module was a wooden structure that covered the guts of the radio, leaving only the tubes and their sockets showing. A complete 8 tube schematic is shown on page 84 of the Nov 1927 CRCB. The same magazine article shows several examples of audio amps which can be added to the "Six-In-Line".
    E. I. S. / Leutz Experimenter's Information Service, Inc. Armstrong Super-Heterodyne   July 1922 M 8  ??   4 R-C 99 ? Resistance Coupled Resistance Coupled Charles R. Leutz Long Island, NY WA - July 1922 - P5 - Manufactured Have early ad scanned. Not Het. R-April1922.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " (Model L  Resistance Coupled]   1922 M / K 10     R-C / L-C 99 Resistance or Inductance Coupled Resistance or Inductance Coupled  "    "    "    " "    "    "    "    " John Wolkonowicz told me of this one. Believed to be shown in 1922 QST.  Two 40" cabinets make up the "L".  Typically, "Amplifier Half" on top of the "Receiver Half", but best possible position is side by side. IFs were resistance-coupled.  RCA UV1712s audios used.  8x40 (8 deep) inch panel. See Note 19.  Located at 220 West 42nd Street, NYC.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Model L  [Transformer Coupled]   October 1922 M / K 8     RCA UV-1714 Misc 30 Iron ??  "    "    "    " "    "    "    "    " RWI - Oct 7, 1922 - P3, 4, & 5 - Lite Construction X RWI, Oct 7, 1922, P3: "Superheterodyne As Applied To Armstrong's Superregenerative Circuit"  Two 40" cabinets make up the "L".  Typically, "Amplifier Half" on top of the "Receiver Half", but best possible position is side by side. IFs work at 30 KC (RCA UV1714s). Reportedly only 4 or 5 known to exist. "When repairing this set, NO soldering acid must be used. All soldering must be done with a flux of alcohol and rosin."  8x40 (8 deep) inch panel. See Note 19.  Located at 220 West 42nd Street, NYC.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Model L  [Transformer Coupled]   October 1922 M / K 10     RCA UV-1714 Misc 30 Iron ??  "    "    "    " "    "    "    "    " RN - January 1923 - P1393 RWI - Oct 7, 1922 - P3, 4, & 5 - Lite Construction X RWI - Oct 7, 1922 - P3 X RWI, Oct 7, 1922, P3: "Superheterodyne As Applied To Armstrong's Superregenerative Circuit"  Two 40" cabinets make up the "L".  Typically, "Amplifier Half" on top of the "Receiver Half", but best possible position is side by side. IFs work at 30 KC (RCA UV1714s). Reportedly only 4 or 5 known to exist. "When repairing this set, NO soldering acid must be used. All soldering must be done with a flux of alcohol and rosin."  8x40 (8 deep) inch panel. See Note 19.  Located at 220 West 42nd Street, NYC.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Model C   April 1923 M / K 8 2 or 3 RCA UV-1716 / General Radio / Acme Open Frame / E. I. S. Misc or Tuna Can 43 /         50 / 47 Iron or Air Iron or Air  "    "    "    " "    "    "    "    " RN - July 1923 - P? Blue prints offered to the public April '23. Radio News, July 1923, first "C" ad. The "C" was in the marketplace nearly a year before RCA introduced their Super-Het. Note 20: "...uses eight tubes. Depending upon the sockets and filament rheostats, the tubes can be Type UV199 or Type UV201. It is designed for loop antenna, but an external adapter unit was available for outside antennas. The Model J 2-stage RF amplifier was also available. References: Antenna Adapter "K" and the 2-stage regenerative RF amp "J".  The Model C has 4 rheostats and one 'stabilizer' potentiometer. The audio stages are biased with a 4 1/2 v. C battery inside the cabinet." Early IF transformers were General Electric (RCA) Model 1716s until RCA stopped shipments to EIS in March 1924. Acme Open Frame & General Radio IFs were used until EIS Model C "Radio Frequency" transformers were available. These Model "C" IFs are broadly tuned to peak at 47 KC [6389 meters], whereas, previous maker IFs were 30 KC (10,000 meters). EIS Model C IF transformer has "3 meter selectivity at 300 meters" (1000 KC) according to RN, June '24 ad.  Also sold through Norden, Hauck & Co., Philadelphia, which advertised RN, Aug '24, P252: "Wired" / Complete / Kit / Parts.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Model C-7 Standard   September 1924 K 7 E. I. S. Tuna Can 47 Air Air  "    "    "    " "    "    "    "    " RN - September 1924 - P402 - Complete RN - January 1927 - P842 -Scheme RN info in Jan '27, P842, says Norden Hauck provided all the data for the schematic. Says RCA UV1716 IFs would be a good substitute for EIS coils.  Early versions did not have removable fixtures for the antenna inductances & oscillator couplers. Most didn't have engraving on front panel that said "Superheterodyne" & may have been only those shipped early. 1st tube is Oscillator, 2nd is 1st detector, 3rd is RF amp, 4th is second RF amp, 5th is 2nd detector, 6th is first audio, & 7th is last audio. All UV201A tubes. "New Model C-7". "The Rolls-Royce of Reception". Note 20:  "...uses 7 tubes & no loop. Inputs are provided for long & short antennas. One less IF stage than Model C. Has only 2 rheostats, one marked 'Master' & one for the 2nd IF marked 'Volume'. No 'Stabilizer' control. Uses 2 C batteries - 9 v. for the 1st detector & 4.5 volts for audio - also located inside cabinet." "...used 2 tuning caps by General Radio & the osc cap was marked 'Heterodyne' & antenna tuner was marked 'Wave Length'...Sockets by General Radio, audios were General Radio Type 231A or GE Model UV712 & meters were Jewell or Weston. Western Electric made bypass caps & filament switch." Three jacks - one for each audio stage. Two different styles of IF train (see pix). IFs are broadly tuned to peak at 47 KC [6389 meters].  EIS Model C IF transformer has "3 meter selectivity at 300 meters" (1000 KC) according to RN, June '24 ad. Assume C-7 is same.  Model C-7 is a First Harmonic. "...Experimenter's Information Service C-7 design...". No untuned, no tuned, 2 IFs, 2 Audio ^. "Improved Regenerative".  RB - Dec '24 ad references "C", "K", and "J" models.  8x40 (7.75 deep) inch Formica panel.  Still promoted under Norden Hauck, Inc. in "What's New" PR - July 1926.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Model C-7 Improved   October 1924 K 7   "   "   "   Tuna Can 47 Air Air  "    "    "    " "    "    "    "    " RB - October 1924 - P540ish - Parts / Kit / Complete Most did not have engraving on the front panel that said the word "Superheterodyne". The 1st tube is the Oscillator, 2nd is first detector, 3rd is RF amp, 4th is second RF amp, 5th is second detector, 6th is first audio, and 7th is last audio. All UV201A tubes. Note 20: "Model C-7 Improved had copper shielding on the interior without the customary voltmeter and ammeter at a reduced price. Three sets of plug-in coils were available covering 20-600 meters." "...used two tuning capacitors made by General Radio and the oscillator capacitor was marked 'Heterodyne' and the antenna tuner was marked 'Wave Length'...Tube sockets were made by General Radio, audio transformers were General Radio Type 231A or GE Model UV712. Western Electric made the bypass capacitors and filament switch." General Radio IFs were used until EIS Model C "Radio Frequency" transformers were available. Had three jacks - one for each audio stage. Another good ad in PR, Nov '24 on P51 promotes complete set. IFs are broadly tuned to peak at 47 KC [6389 meters].  EIS Model C IF transformer has "3 meter selectivity at 300 meters" (1000 KC) according to RN, June '24 ad.  Assume C-7 is same.  8x40 (7.75 deep) inch Formica panel.  Still promoted under Norden Hauck, Inc. in "What's New" PR - July 1926.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Model C-7 Deluxe   (Note 20) K 7   "   "   "   Tuna Can 47 Air Air  "    "    "    " "    "    "    "    " The 1st tube is the Oscillator, 2nd is first detector, 3rd is RF amp, 4th is second RF amp, 5th is second detector, 6th is first audio, and 7th is last audio. All UV201A tubes. Note 20: "Deluxe Model C-7 had all the connecting terminals on the rear instead of the front panel and came without meters. It had only one 'Master' rheostat and only one audio output jack. The others had three jacks -- one for each audio stage."  "...used two tuning capacitors made by General Radio and the oscillator capacitor was marked 'Heterodyne' and the antenna tuner was marked 'Wave Length'...Tube sockets were made by General Radio, audio transformers were General Radio Type 231A or GE Model UV712. Western Electric made the bypass capacitors and filament switch." IFs are broadly tuned to peak at 47 KC [6389 meters].  EIS Model C IF transformer has "3 meter selectivity at 300 meters" (1000 KC) according to RN, June '24 ad.  Assume C-7 is same.  8x40 (7 3/4 deep) inch Formica panel. 
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Model C-7 Special   K 7   "   "   "   Tuna Can 47 Air Air  "    "    "    " "    "    "    "    " Ron Lawrence reference to a set he has - 060304.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " (C-3 Custom Super-Heterodyne)   (1925) K 7     "   "   "   Tuna Can 47 Air Air  "    "    "    " "    "    "    "    " Three-Dials. John Wolkonowicz told me of this one. Model not verified but likely. It's a model C-7 inside and a Model C-10 outside. See these notes: Panel is 40". Leutz says the C-10 is, "…a C-7 Model...with (three) stages of TRF…". Note 20: "Model C-10 is similar to the C-7, but has three tuned RF stages ahead of the first detector for a total of 10 tubes and five tuning capacitors. The RF tuning is ganged so there are only three tuning dials. This model was designed for the Navy with plug-in coils covering 50-600 meters."  IFs are broadly tuned to peak at 47 KC [6389 meters].  EIS Model C IF transformer has "3 meter selectivity at 300 meters" (1000 KC) according to RN, June '24 ad.  Assume C-7 is same. 
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Navy Model C-10 Super-Heterodyne   February 1925 K 10     "   "   "   Tuna Can 47 Air Air  "    "    "    " "    "    "    "    " PR - May 1925 - P55 - Complete Leutz  [Note 7] - P131 Leutz  (Note 7) - P132 Three-dials. "…this new design by Charles R. Leutz...".  RB June 1925 P298 ad by Norden-Hauck. First 3 stages are TRF, a regen detector, then, Osc., 2 stages of IF, 2nd detector, and 2 stages of AF. Leutz says, "…a C-7 Model...with stages of TRF…". Note 20: "Model C-10 is similar to the C-7, but has three tuned RF stages ahead of the first detector for a total of 10 tubes and five tuning capacitors. The RF tuning is ganged so there are only three tuning dials. This model was designed for the Navy with plug-in coils covering 50-600 meters."  Scheme also in RN, Dec '25, P821.  IF frequency is 6389 meters [47 KC].  No untuned, 3 tuned, 2 IFs, 2 Audio ^. Complete: $250.00 ^.  Sold by and changed to Norden-Hauck, Inc. in PR June '25 ad. IFs are broadly tuned to peak at 47 KC [6389 meters].  EIS Model C IF transformer has "3 meter selectivity at 300 meters" (1000 KC) according to RN, June '24 ad.  Assume C-7 is same.  Panel size is 28 3/16" x 8".  Still promoted under Norden Hauck, Inc. in "What's New" PR - July 1926.
      "    "    "    " "    "    "    "    "    "    "    "    "    "    "    "    " Universal Transoceanic Type L- 6   September 1926 M / K  "    "    "    " "    "    "    "    " Used as a Frequency Changer front end for Leutz's TransOceanic Type L-6. Picture sent from Dale Davenport
    E. I. S. - Colburn n / a Colburn Superheterodyne     CB     Email from Dale - Maybe 2005 - "I Have also received a whole grouping of pictures of the Colburn Super that seem to indicate it's mostly E.I.S. internally."
    Electrical Research ^ Electrical Research and Mfg. Co. ^ Super Heterodyne ^   1924 ^ CB (No other information available.)
    Ellis n / a "Using What Junk You Have In Making a Super-Heterodyne"   December 1923 CB 6  "    "    "    "    " "    "    "    " RB - December 1923 - P143 - Construction RB - December 1923 - P144 & 145 Use parts from your previous projects to build a Super.
    "    " Ellis Electrical Laboratory Ellis D Coil   November 1927 P Chicago CRCB - November 1927 - P236 - Parts Oscillator coil used in the Thompson Super Seven. Ad says "R. F. Coils Matched Set".
    Ensall Ensall Radio Laboratory Model 780 Super Heterodyne   September 1929 K 7 Warren, Ohio (CRCB) - September 1929 - P126 - Kits Model 770 is described as a seven tube TRF design and the model 780 as a eight tube "Super."   Both used A / C Shield Grid tubes,  and P-P audio. 1208 Grandview Avenue.   Info from Dale.
    ERLA Electrical Research Laboratories Town and Country ^  Model S14   1925 ^ CB 6 ERLA Misc Chicago eBay Pictures X eBay pix. Used 199s. Portable with loop antenna. Three IFs. Probably NOT reflexed. Might be an "Acre" portable case.
   20          158 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
    Feldstern-McCusker Radio American Radio Stores, Inc. Five Tube Baby Super-Het   November 1924 BK 5                                 Philadelphia TR - November 22, 1924 - Back Cover - Manufactured           "Coast to Coast Low-Loss Set. Ease and simplicity of tuning make it the ideal receiver for all the family. A exquisite instrument encased in a beautifully finished Genuine DeLuxe Mahogany Cabinet that will adorn any home. Guaranteed to bring in distant stations. $59.75 Equal to any $150.00 set."
  X Flewelling Frequency Changer n/a Flewelling Frequency Changer   September 1925 B 2 2 - 201A (7 x 10) 2 1 N L n / a n / a   n / a n / a n / a Edmond T. Flewelling Chicago Radio In The Home - September 1925 - P?? - Construction   Radio In The Home - September 1925 - P?? - Scheme   Flewelling was "the inventor of the Flewelling Superregeneration Circuit of the early broadcasting days". [Wonder what Armstrong had to say about that!] Radio In The Home issue describes how to build the Freq. Changer with all the coil winding info and schematic.
  X Flewelling 8 (Flewelling Radio Company) Flewelling 8 X January 28, 1928 BK 8 7 - 201A                & 1 - 171A (7 x 24) 2 2 N TL Flewelling NIF   NIF NIF NIF Edmond T. Flewelling Chicago N.Y. Sun Newspaper - January 28, 1928 - Light Construction X N.Y. Sun Newspaper - January 28, 1928 - Light Scheme X Flewelling was "the inventor of the Flewelling Superregeneration Circuit of the early broadcasting days". [Wonder what Armstrong had to say about that!] Used an interesting "capacity strip" to hook most wires to under the sub-panel. Leaves only about six inches of external wiring. The sub-panel, supplied by Flewelling in the kit, is already drilled with tube sockets already mounted on it. It's drilled for all transformer terminals. Flewelling name is the top of each IF transformer and "these trade marks should all read right side up from the front panel." If not, the transformer must be reversed. Used four Flewelling Long Wave transformers, one Flewelling T.R.F. transformer, and two Flewelling audio transformers. Used the center lead and one outside lead of a tapped loop.
    Fournier n / a Fournier Four Filter Eight Tube Super-Heterodyne   March 1925 CB 8 3   60 Jacques Fournier Chicago RDI - March 7 & 14, 1925 - P17 - Construction RDI - March 7 & 14, 1925 - P18 This is a three-dial set!  "A filter circuit is nothing more than a stage of tuned RF designed for a long wave length and permanently tuned for that wave length….It occurred to the writer (Fournier) that the intermediate stages of a super-heterodyne might just as well be designed as tuned RF amplifiers operating in the neighborhood of 5000 meters." Used 201As or 199s. 7x30 inch panel.
  X Framingham Framingham Company, The Framingham K. D. Super Heterodyne PNF (1924) K 8 Framingham Tall Cylindrical 50 Air Air Farmington, Mass. Dale Davenport Brochures - (1924) - Kit X I have several copies of these Dale sent. From Dale Davenport: "I am probably the only person at this point who has much of anything on the Framingham Superhet. Charles Fisher, Historian, collector of Western Electric and other radio gear,  lives in Framingham and didn't know of the existence of this set till I contacted him.  Kit was called the "Farmingham Super Combination.Only Framingham kit and loop to turn up thus far. Unbuilt with several factory prints and drawings, parts lists, and even a dealer's price list. I have one master schematic, 11x24"; Five smaller schematics, 6x12"; Three pictorial hook up prints,  w/t legend, 8.5x15.75"; Two  four page (three printed)  Instruction books, 8.5x5.5"; One Audio Frequency Transformer sheet, 6x9", One 50 Kc RF Transformer sheet, 3.75x 6"; One IF Transformer sheet, 3.75x6"; One Oscillator Coil Sheet, 3.75x6", One Dealer's Price List - Four pages, 8.5x11"  White in color; Four  Dealer's Price sheet,  pale green with dealer discount on back, sized  8.5x11".  About 20 pcs of paper came with the kit."  $100 complete with Farmingham branded parts.
  X Frank Everlast Radio Products Co. Frank Super-Kit X November 1, 1924 K 8 Frank Cylindrical New York City RWI - November 1, 1924 - P33 - Complete X Kit contained 3-Frank Matched IFs, 1-Input Tuner, and 1-Input Transformer. Used 2-triple panel mounted sockets and 2 individual sockets. Should have a Jewel 0-8 volt meter in the panel.  Cabinet came in black or mahogany finish.  Complete all parts kit (knockdown) $85.  Located at 27 Park Place.  RN - December 1924 - P1103 - Kit.  Perfection Radio Corporation (78 Cortlandt Street, NYC) were the stores in NYC that promoted the "Famous" Frank Super-Kit; may have been associated. Provided demonstrations. See ad in RWI, Nov 8, '24, P34.  "Send no money at all...Just fill in the coupon and then pay the express man when he delivers it.Try it in your home for two weeks."  Drilled and engraved (likely Formica) 7x26 panel.
    Foltz Foltz Radio Company New Five Tube Wonder Circuit   August 1923 CB 5 New Castle, Penna. RB - August 1923 - P? - Complete  
    Foy n / a Seven Tube Super-Heterodyne On Wheels   August 1924 B 7 (Unknown) "Barney" Foy Washington, D. C. RN - August 1924 - P160 - Article Barney Foy , developer, constructed Super-Het for the Raquet Club in Washington, D. C.
  X Frederick Tustin Radio Frederick Super-Heterodyne PNF May 4, 1924 K & P NIF NIF NIF NIF NIF NIF NIF (Frederick) NIF NIF NIF NIF NIF (Frederick)       San Francisco PBPW - May 4, 1924 - Back Cover - Kit & Parts X         Back cover ad for this set. Nothing else known. Tustin Radio at 428 Sutter St.
    G. A. Sales, The G. A. Sales, The Super Heterodyne   May 1924 CB                                   St. Paul, Minn. RN - May 1924 - P1684 - Blue Prints           Small RN ad.
    General, The General Radio Repair Co. "The General" Super-Heterodyne   January 1925 CK 7 7 - 199 (7 x 28) 2 2 N Silver Marshall Aluminum Square X 60 Steel McMurdo Silver X Chicago Everybody's Radio Weekly [ERW]                                                                             January 31, 1925 - P20 - Ad   X X This was the Silver Marshall Laboratory Model. It had aluminum blocks shown RB June '25.  Kit (shown in PR June '25) includes 2 "Two-Ten"s (IFs) which peak at 5000 meters (same IFs used in the 401 Unit), 1 "Two-Eleven" (Filter), and 1 "101B"(Coupling Unit) with instructions. Used 199s. Had 1.5 volt flashlight battery for tube bias while SM used a 4.5 volt bias battery.  See Silver Marshall. General Radio Repair, 36 West Randolph, Chicago. Picture of the set in the ad is inverted possibly to hide the fact it's a SM radio.  Panel appears to be 7x28, rather thn 7x24.
      "    "    "    "    "   "    "    "    "    "    "    "    " Medium Frequency Transformer - Type 271 X July 1924 P n / a n / a General Radio Misc X 33 Iron Air "    "    "    "    "    " RB - July 1924 - P273 - IFs QST - December 1924 - P9 - Transformer "Type 271" only X Transformer peaks at 9000 meters ("around 10000 meters".)  IFs and Filter unit used brass shells for isolation of the windings. Excellent ad in PR, Oct '24, P67. See E. I. S. for usage.
      "    "    "    "    "   "    "    "    "    "    "    "    " 30 Kilocycle Superheterodyne [1st Model]   Fall 1925 CB 7 General Radio Misc X 33 Iron Air "    "    "    "    "    " CRCB - Fall 1925 - P72 - Parts CRCB - Fall 1925 - P73 - Construction CRCB - Fall 1925 - P74 Used three "Type 271 " IFs & one "Type 331 - 30 KC Tuned Transformer". No parts list.
      "    "    "    "    "   "    "    "    "    "    "    "    " 30 Kilocycle Superheterodyne [2nd Model]   Fall 1925 CB 7 General Radio Misc X 33 Iron Air "    "    "    "    "    " CRCB - Fall 1925 - P72 - Parts CRCB - Fall 1925 - P130 Completely different than above. Used two "Type 271 " Ifs, one "Type 331 - 30 KC Tuned" xfmr, & 4 rheostats. No parts list.
    General Radio General Radio Company Six Tube Super Heterodyne   April 1924 BK 6 General Radio Misc X 33 Iron Air Cambridge, Mass. (QST - April 1924 - P?? - Construction) (QST - April 1924 - P?? - Construction) General Radio IFs are iron core with a tuned air core filter transformer. In Spring 1926 (Barawik Catalog P28), this same case was used by Thorola for their "Gold and Black" audio transformer with connectors on the sides. A similar Branston case had the connectors front and back, not on the sides.
    General Radio - Anderson n / a DX Super-Heterodyne   November 1925 BK 8 * General Radio Misc X 33 Iron Air J. E. Anderson   RWI - November 21, 1925 - P3 - Construction X RWI - May 15, 1926 - P10 - Scheme Referenced in RWI May 15, '26, Index.  Equivalent to 9 tubes: First six tubes are 199s and the last three are 201As.  Used Carborundum fixed crystal as first detector and Amperites in all filaments. First stage is a tuned RF amp.  Filter & IFs transformers are unnamed and oscillator coil can be of any commercial type. Scheme shows iron core IFs. All coil windings are given.  Metal shield around oscillator stage. Believe J. E. Anderson works for RWI.
  X General Radio - Bernard n / a Bernard Portable X April 3, 1926 BK 8 199. 201A 7 x 18 General Radio Misc X 33 Iron Air Herman Bernard RWI - April 17, 1926 - P10- Construction X Used two General Radio 271 transformers with the filter unit and three Meloformer audio transformers. Four part weekly construction article RWI, Ap 3, 10, 17 [X], & 24. '26. Used either 199s or 201As. Might have a centered panel meter.  7 x 18 inch panel. 
  X General Radio - Best n / a  Best Modified Superheterodyne Shielded Model X (Fall 1925) BK 7 7 - 199 10 x 21 3 2 1 - V W Remler Cylindrical X 45 Iron Air Gerald M. Best X "    "    "    "    "    "    "    " RN - Note 21 X RN - Note 21 X Three-dial Super. The center dial on the front panel is connected to the variometer which varies the inductance of the antenna tuner. See Note 21. "All Wave". Used UV199s.Completely brass shielded. Could have General Radio 271, Jefferson 150, Silver Marshall 60 KC, Baldwin-Pacific Shielded IFs. Remler NOT mentioned! But, Best mentioned in the article that the IF should be between 40 and 50 KC, which, at 45 KC, would be perfect for the Remler IFs. Maybe didn't want to create conflict of interest. Sub-panel is 16 gauge brass and is 7x16. Brass shields were used to sepaarate various sections of the radio inside the case.  Adapted to a long wire outdoor antenna. A hand-wound "loading coil" was used to compensate for various lengths of antenna wire starting at 75 feet.
    General Radio - Brunn n / a Five Tube Super-Heterodyne   00…………………. BK 5 [+ audio] General Radio Misc X 33 Iron Air Brunsten Brunn RWI - January 8, 1927 - P9 - Lite Construction RWI - January 8, 1927 - P9 Article says "The intermediate transformers may both be General Radio filters (331 type)."  Antenna & oscillator coils were homebrew.
  X General Radio - Fenway Everyman's n / a Fenway Everyman's Receiver  X February 1926 BK 9  [4 ******] 9 - 201A 8 X 28 3 2 1 -V                   & 1 - MA W General Radio Misc X 33 Iron Air Leo Fenway New York City RWI - March 6,1926 - P2 - Complete Parts   RN - June & July 1926 - P?? & P44 - Construction   RN - June 1926 - P1656   Three-dial set!  Switches from 4-tube Regenerator to 9-tube Super Het. "One stage of TRF with regeneration, a non-regenerative first detector, three stages of iron core medium frequency amplification--from 30 KC to 60 KC--a non-regenerative second detector, and two stages of transformer coupled audio frequency."  Three-part weekly series in RWI beginning Feb. 6, '26 (13 & 20).  Although brand of parts is not specified in April '26 RN, developer used Silver-Marshall Oscillation Coil and IFs. April '26 RN shows scheme & much more info. Ad in RWI March 6, '26, P2, and RN June '26 show General Radio IFs. Also see Note 21. Schematic also in Secor's "Super Het - Which One?" - Radio Listener Guide (No Month 1927). Quoted from Secor article (Publication unknown): "One of the latest superheterodynes which comprises simply a few improvements in the general circuit arrangement, coupled with one stage of tuned radio frequency ahead of the first detector, and shielding, to increase the range of reception, is known as the Fenway. On studying this circuit you will see that you can utilize the features of this super?het if you already own one, by simply adding one stage of tuned radio frequency ahead of the first detector. Mr. Fenway in his superhet shields various parts of the circuit, and those interested in these desirable features should peruse carefully the articles which have appeared in various radio journals. Referring to Fig. 3, the diagram of the Fenway superheterodyne, you will note the antenna coupler. This may be any standard coupler with or without a rotor which is not used, the proper size of variable condenser being used to tune the secondary of course. Next for our consideration comes the radio frequency coupler labeled L1 and L2. As diagram Fig. 4 shows, this coupler “B” may be an ordinary variocoupler, using the secondary or tickler as the rotor P, the secondary of the coupler being tuned by a suitable size variable condenser, V. The oscillator coupler with the three coils, L3, L4, and L?5, may be of any standard form, or else constructed according to Mr. Fenway's specifications, as given in articles referred to. The intermediate transformers may be of any well-known make, Mr. Fenway specifying those of the iron core type. (Likely S-M - Editor) This super-heterodyne requires three tuning controls or variable condensers, and it is the writer's opinion that the same results can be obtained with a nine tube lineup, utilizing an extra stage of intermediate radio frequency (4 stages in all), as pointed out previously."Fenway, 29 West 64th Street, NY. Moved in Dec '28 to 831 Eighth Ave (across from Madison Sq Garden)...then known as DX, Inc.  Entire radio is shielded as around inside of the case, top to bottom, and individual tubes stage copper shielding.  (I bought this radio in August 2007 for $1750 including shipping from a collector in New Jersey. He had it for some 15 years and knew the original builder! Entire set of parts might have been bought from "Chas W. Down" radio shop in New York. See ad.)
    General Radio - Funkerburk Funderburk Engineering Corp. Superheterodyne Receiver   (1925) CB 7 General Radio Misc X 33 Iron Air Boston Pictures from eBay 01-15-04.  Used General Radio parts inside & out. An Ameritran Deluxe Audio. Used 301 voltmeter.  Mahogany case. Measures 27 ¾" x 8" x 10" deep. Panel slightly wider than the case. Weighs 35 pounds. 
  X General Radio - Hollingshead n / a Super-Heterodyne De Luxe  X March 1926 BK 8 7 - 199 & 1 - 120 7 x 18 2 2 Y General Radio Misc X 33 Iron Air Paul Hollingshead J. E. Anderson RWI - March 20, 1926 - P3 - Construction X RWI - March 20, 1926 - P3 - Scheme X Compact set. Used 7 - UX199s and one UX120. Most wiring under baseboad. Picture of set on front cover of RWI issue. General Radio IFs (271) are iron core with a tuned air core filter transformer (331). Article says the IFs can tune 30 to 60 KC. Oscillator circuit was of the Hartley Parallel Feed type. Meter that was recommended was a Weston Voltmeter. Panel is 7x18 inches.
    General Radio - QST   X August 1924 BK   (QST - August 1924)   (QST - August 1924)    
  X General Radio - St. Louis Daily Globe St. Louis Daily Globe-Democrat St. Louis Daily Globe-Democrat Superheterodyne X Summer 1926 BK 6 6 - 199 7 x 21 2 3 N W General Radio Misc X 33 Iron Air St. Louis Daily           Globe-Democrat Staff St. Louis RN - [Note 21] X RN - [Note 21] X Get pictures and scheme from RN, "Superheterodyne" book. Only two IF stages. All General Radio parts. Look for a thin piece of copper over the baseboard and behind the front panel for shielding as designed.
    Gilbert - Remler Gilbert Gilbert Superheterodyne Model Z5 X (1925) CB 8 8 - 199 Remler Cylindrical 45 Iron Gerald. M. Best Appears to be Remler Best with Gilbert name on the mottled dark brown & black front panel.  On eBay (1103). Shows nice battery box. Used 199 tubes. Seller said the cabinet size is 31x14.5x9.5.  Apparent terminals for loop.
    Goldsmith n / a Short-Wave Code Signals Super-Heterodyne   May 1928 CB 5 [+ 1] 4 (Unknown) 50 Lloyd T. Goldsmith RB - May 1928 - P13 - Construction RB - May 1928 - P13 Four-dial receiver. First three dials tune the IFs. It has a separate one tube unit attached to a 5 tube Super. Sixth tube is Beat Fequency Oscillator controlled by the fourth dial. This Super Het is used in conjunction with the "Universal Short-Wave Receiver" on page 13 by the same developer.   Completely shielded with front dial meter. 7x24 inch panel.
    Globe Globe Radio Equipment Company Super-Heterodyne Kit  "Original Globe Coils"   August 1924 K Globe Radio Equipment New York City RN - August 1924 - P240 - Kit "Consists of Oscillation Coupler, One Input Transformer, 3 Intermediate Transformers. All transformers are matched and mounted in a single unit. Complete wiring diagram with each kit".  Kit is $15.
    Godley n / a Godley Super-Heterodyne   December 1921 CB Paul F. Godley X Leutz  [Note 7 - P151] December of 1921, Godley received the first signals from across the Atlantic Ocean from Scotland, using his homebuilt Super-Het, maybe a Leutz design. Note 4: P108-110.
      "    " n / a Paragon Super-Heterodyne   February 1923 CB 9   "    "    "    "    " X (RB - February 1923 - P?? - Construction) RB - April 1923 - P502 Godley's (based on Armstrong's Super Het) has RC networks rather than IFs.  RB Feb 1924 P330 article called "Supersensitive Long-Range Receiver"
    Graybar ^ Graybar Electric Company ^ Model 330 [A-C] ^   1929 ^ M 9 RCA ???? $147.00 ^.   Division of Westinghouse ???
      "    "    "   "    "    "    "    "    "    "    "    " Model 330 [A-C] Console   1929 M 9 "    " ???? Division of Westinghouse ???
      "    "    "   "    "    "    "    "    "    "    "    " Model 340 [A-C] ^   1929 ^ M 9             "    "                   ????             Same as RCA Model 62.  $375.00 ^.
  31    189 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPE FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
    Haddaway Haddaway Incorporated Haddaway Resistance Coupling Unit X January 1925 P n / a     n / a       Haddaway Flat Sqaure     Resistance           Los Angeles RN - January 1925 - P1332 - Coupling Unit Only X         Appears to be RC coupling unit for Supers.  $99.50 ^. Located at 1806 South Hoover St.
    Halldorson Halldorson Company, The Halldorson Shield Grid Super 8  [DC]   Fall 1928 BK 8 Halldorson Chicago Westrad Catalogue - Fall 1928 - P45 - Complete Used 3 - 222, 3 - 201A, and 2 - 171 or 112 tubes in push-pull.  Shield Grid used in 1st RF and IFs.  Can feed phono pickup through the amplifier stages. DC version lists for $83.30,  Westrad price $48.98. See Thompson, Walt S., Jr..
      "    "    "    "   "    "    "    "    "    "    "    "    " Halldorson Shield Grid Super 8  [AC]   Fall 1928 BK 8 "    "    "    " "    "    " RSWC - October 1928 - P30 - Complete X Used 2 - 227, 4 - 226, and 2 - 171 or 112 tubes in push-pull.  Shield Grid used in 1st RF and IFs. Two stages of S. G. IFs.  Can feed phono pickup through the amplifier stages. AC [110 v, 60 c] version lists for $86.30,  Westrad price $50.75.  AC Power Supply using 280; lists $37.00, Westrad $21.76. See Thompson, Walt S., Jr..
    Halowat  (possibly) Hallock and Watson Halowat Superhet  (possibly)   (1924) (M) 8 Remler Cylindrical 45 Iron Gerald M. Best Portland, OR From Dan Merz  (djmerz@3-cities.com)  Has this set.  Said "Same manufacturer as more common 'Halowat TRF'."
    Hanscom Hanscom Radio Devices Superunit   November 1924 K 4 [+ 2] 9 x 18 Hanscom Misc Module Allan T. Hanscom Woonsocket, R. I. RB - Januaryuary 1925 - P615 - Module RB - November 1924 - P40 - Construction RB - November 1924 - P44 This is for the six tube Super Het. With the Hanscom 4-tube Module, two tubes are outbound. RB for Nov '24 has 9x18 inch panel. Barawik for Fall '25 (P21) says: "...consists of a blocking tube to prevent radiation from the oscillator, one stage of untuned radio frequency amplification, the oscillator, two tuned stages of intermediate frequency amplification, and the detector on only four tubes".Also, lists 199  & 201A versions. $31.25. Barawik, Oct '26, P36: "Type A" is for standard 201As & "Type C" is for UX201A & UX199s. Also, says $29.50 each. There is a "Type B", possibly for UV199s.  "Knockdown" still listed in RTD, Aug '25. Panel can be as small as 7x18 inches.
      "    "    "   "    "    "    "    "    "    "    " Hanscom Four-Tube Super Set   Spring 1926 K 4 7 x 10  "   "   "   "   "    "    "    "    " "    "    "    "    "    " Barawik Co. Catalogue - Spring 1926 - P30 - Complete Complete 4 tube Super using Superunit. Has 1 RF regenerative detector and 2 audio stages. Includes "S. C. Capacity Element" with engraved panel (Says "Hanscom Super Set") and gold plated fittings. $39.25  Simply, the panel, two variable capacitors, and a Martin Copeland single dial. Used with the Superunit Junior. 7x10 inch panel. $12.15
  X   "    "    "   "    "    "    "    "    "    "    " Hanscom Six-Tube Super Set X Spring 1926 K 6 6 - 201A 7 x 18 1 or 2 4 ? 1 - V    "   "   "   " Exposed diamond-weave & large cylinder X   Air Air   "    "    "    "    " ? "    "    "    "    "    " Barawik Co. Catalogue - Spring 1926 - P30 - Complete Complete 6 tube Super using Superunit. Includes loop, engraved panel (Says "Hanscom Super Set"), meter, 6-sockets, 2-Thordarson audio xfmrs, and gold plated fittings. $59.40  Simply, the panel, two variable capacitors, and a Martin Copeland single dial. Mght have two dials in close proximinity without single MC dial. 7x18 inch panel. Used with the Superunit Junior that has a 7x10 inch panel. $12.15
      "    "    "   "    "    "    "    "    "    "    " Hanscom Superunit Auto Set   Spring 1926 K 4  "   "   "   "   "    "    "    "    " "    "    "    "    "    " Barawik Co. Catalogue - Spring 1926 - P30 - Complete A 4-tube Super designed for an auto. Completely enclosed. Front panel has two-dials, light, rheostat, and lock. Back panel has audio jack, battery clips, and a knob. It's 3 1/2 inches deep and Used two bolts to hold it. "Specifications: 4-201As, RF detector, 2 stages Thordarson audio". $27.95
    Hardy & Sons Hardy & Sons, L. H.  Toroidal Transformer  ["Toro-Tran"]   February 1924 P n / a n / a Hardy 90 New York City PR - February 1924 - P42 - Transformer Only Ad says "After many months of testing and experimentation, our research engineer has developed a Toroid Radio Frequency Transformer for use in neutrodynes and Super-Heterodyne circuits. 3,300 meter type $9.50."
    Haynes Haynes-Griffin Radio Service, Inc. Haynes Multi-Unit Super-Heterodyne   September 1923 BK 7   McMurdo Silver-Wound Vertical Tuna Can 99 Air Air A. J. Haynes                           / McMurdo Silver New York City PR - Sept / Oct / Nov / Dec 1923 - Various - Construction PR - Sept / Oct / Nov / Dec 1923 - Various From articles in PR in 1923, Sept ("Haynes DX Receiver"), Oct (Haynes Two-Step Amp), Nov (Separate Oscillator),  & Dec (Intermediate Wave Radio Frequency Amplifier). Special thanks to McMurdo Silver for developing the IFs?? Used a Haynes-Griffin Oscillator Coil. Haynes audio amp is in Oct '23 issue.Layout shown again. RB - Mar 1924 - P416 & 417 / P456ish for pix of IF in ad??? CRCB May 1924 has complete article on construction with scheme.  PR, Oct 24, P371: Schematic.   PR, June '24, P71 shows three (3) unit Simplified Super??? Tuned to 3000 meters??? This set was reconstructed by Billy Richardson. Haynes advertised in 1922 in RN.  See his pix.
    Haynes Griffin Haynes-Griffin Radio Service, Inc. Simplified Super-Heterodyne   January 1924 K 7 TL Haynes-Griffin Tall Square 100 Air Air A. J. Haynes New York City RB - January 1924 - P "I" - Complete / IFs & Osc Coil RB - January 1924 - P210 - Construction RB - January 1924 - P213 Set Used tall square IFs first advertised in PR Dec 1923 (X).  McMurdo Silver was Haynes' assistant who helped build 20 Hets (some shown in article including a three-dial version) in the Fall of 1923 before this set was described as the best. It used square black case IFs. It's based on the multi-cabinet set immediately above. Construction article in Jan '24, RB. This Super was first tested at WHAS, Radio Broadcast Labs, Louisville after 19 previous models! McMurdo Silver went on to be Hayne's store manager when the Chicago location was opened. Panel is 7x24 inches.
      "    "    "    "    "   "    "    "    "    "    "    "    "    "    " "New and Improved Radio Apparatus"   February 1924 K n / a n / a n / a n / a n / a n / a n / a Haynes-Griffin Tall Square 100 Air Air "   "   "   "   " "    "    "    "    " RB - February 1924 - Back Pages - IFs / Osc Coil These IFs are black, vertical rectangular. Pre-drilled panel advertised: 7x24 Hard Rubber.  "Ask for complete price list."
      "    "    "    "    "   "    "    "    "    "    "    "    "    "    " Laboratory Matched Transformers   April 1924 K n / a n / a n / a n / a n / a n / a n / a Haynes-Griffin Conical 150 Air Air "   "   "   "   " "    "    "    "    " PR - July 1924 - P280ish - IFs Only April '24 (RB - Back Pages) had these slightly cone-shaped IFs.  Most likely they were Air Core at 150KC (2000 meters), according to the Haynes-Griffin newsletter of Oct 1924.  Another ad in CRCB 1924. RN, June '24 P1833 shows Kit / Parts. Also RB June '24 (Back Page) shows complete / IFs & Osc Coil. This ad shows "coned" IFs, but still shows square IFs on receiver in the pix in ad.   RN, August 24: "Sold only in matched sets of four".  Published booklet, "Trouble shooting in the Super".  Advertised his published book "Solving the Mystery of the Super-Heterodyne" in RDI, Sept. 20, '24 (P23).
      "    "    "    "    "   "    "    "    "    "    "    "    "    "    " De Luxe Super-Heterodyne - Model B   February 1925 BK 9 [6] 199                  & [3] 201A 7 x 18 3 Haynes-Griffin Conical 150 Air Air "   "   "   "   " "    "    "    "    " R - February 1925 - P49 - Complete X R - February 1925 - P15 - Construction X R - February 1925 - P16 X Three (3) tuning dials! TRF front end. "Special type of tuned radio frequency amplification used ahead of the straight super-heterodyne…" Used "Six dry cell and three storage battery tubes".  See De Luxe Model A below (It came last).  
      "    "    "    "    "   "    "    "    "    "    "    "    "    "    " De Luxe Super-Heterodyne - Model A   May 1925 BK 9 201A 7 x 18 3 Haynes-Griffin Conical 150 Air Air "   "   "   "   " "    "    "    "    " RB - June 1925 - P297 - Picture / Description / Blue Prints X Three (3) tuning dials! TRF front end. "Special type of tuned radio frequency amplification used ahead of the straight super-heterodyne…" Used "Nine storage battery tubes".  See De Luxe Model B above (It came first).   7x18 inch panel.
      "    "    "    "    "   "    "    "    "    "    "    "    "    "    " Super-Heterodyne Portable    August 1925 BK 8 Haynes-Griffin Conical 150 Air Air "   "   "   "   " "    "    "    "    " RN - August 1925 - P162 - Portable Set Directory 44 lbs, 21x8x18 inches. Self-contained cone speaker. $100.00.
  X Haynes Griffin - Cockaday n / a Superheterodyne Reflex X January 1925 BK 8 Haynes Griffin Cone 150 Air Air Lawrence M. Cockaday X New York City PR - May 1925 - P43 [Wholesale Radio] - Complete   PR - January 1925 - P36 - Construction PR - July 1925 - P67 Construction article. Scheme also in June 1926 PR on page 157. Used Haynes-Griffin IFs and Precision "Autodyne Coupler" coil in PR - May '25 - P34. Sold thru Randolph Radio Corp. catalogues in 1925 for $65.80 ^.  An ad (PR, March '25, P115) for "Wholesale Radio Service, New York City" says they will build the set and put it into a nice mahogany piano hinged cabinet for $99.50. Unbuilt & without cabinet is $81.30 but no tubes for either. "S. Hammer Radio ad (PR, Mar '25, P126): "Wired complete in mahogany cabinet with Korach loop for $110".
    (Heteroplex) Elvin Radio Co. (Deluxe Heteroplex)   March 1926 BK PR - March 1926 - P295 - "New Products" Maybe this: "Heteroplex Radio Corp., apparatus, $1,500,000.  F. Vondorn, Raymond G. Penglase, New York; E. C. Ballantyne, Jersey City, N. J, (Capitol Trust Co. of Delaware)" RWI, March 7, '25, New Corporations, P15. 
    Hetrola Hetrola Radio Co. Ltd. R-199-P [Portable]   August 1925 BK 7 RN - August 1925 - P162 - Portable Set Directory 35 lbs, 18x14x8 inches. Built-in speaker. $165.00.
    HFL High Frequency Laboratories H. F. L. Transformers   April 1926 P n / a n / a n / a n / a n / a n / a HFL Flat Rectangle X 37 Iron Air Ernst Tyrman Chicago RN - October 1926 -P383 - Kits / Parts Tyrman left HFL to start his own what became famous company in 1927.  IFs: "H.210" Iron-core tuned 32 to 42 KC. "H.215 Air-core tuned to 37 KC. The audio is the "F.320" and the Choke is "L.425" from RN Jan '27, P908. 
      " "    "     "     "     "     "     "     "     " Nine-in-Line Super   September 1926 BK 9 HFL Flat Rectangle X 37 Iron Air Ernst Tyrman "    "    " CRCB - September 1926 - P84 - Parts CRCB - September 1926 - P85 - Construction CRCB - September 1926 - P88 "Tube compliment:  1st detector-201A, 4 IFs-WX12s, 2nd detector-201A, oscillator-201A, 1st audio-201A, 2nd audio-UX112."  RWI, Ap 2, 9, 16, & 23 construction series.  RN, Apr '27, P1245 Construction.  Barawik catalogue, Oct '26, P30 - Complete. Chicago Salvage, Nov '26, P8, $82.50.  Another schematic in RM - Dec 1926 - P128.  7x26 inch panel. 
      " "    "     "     "     "     "     "     "     " N27 Nine-in-Line   March 1927 BK 9 HFL Flat Rectangle X 37 Iron Air (Ernst Tyrman) "    "    " CRCB - March 1927 - P139 - Construction CRCB - March 1927 - P1426 Also, RN, April '27, P1245 ??, Construction, layouts, pix, and scheme. Construction: RWI, April 2, 9, 16, & 23, 1926. 7x26 inch panel.
      " "    "     "     "     "     "     "     "     " N28 Nine-in-Line   September 1927 BK 9 HFL Flat Rectangle X 37 Iron Air Ernst Tyrman "    "    " Harry Alter Catalogue - October 1927 - P56 - Complete X CRCB - September 1927 - P155 - Construction CRCB - September 1927 - P156 Also known as "Improved" or "Nine-Ln-Line Plus". Used NEW Remler Drum Dial. Because of the dial arrangement, it might be called the "Unicontrole Nine-In-Line". See Note 1. Might use the new "C-16" audio and "C-25" output audio.  Ad in H-C Catalogue, Late Summer '27, P68 at $74.95. S. Hammer Radio Co. offered it completely wired in a Corbett cabinet for $167. 7x26 inch engraved panel.  
      " "    "     "     "     "     "     "     "     " Improved Nine-In-Line ???   September 1927 BK 9     HFL Flat Rectangle X 37 Iron Air Ernst Tyrman       "    "    " Harry Alter Catalogue - October 1927 - P56 - Complete X CRCB - September 1927 - P155 - Construction   CRCB - September 1927 - P156   Also known as "Improved" or "Nine-Ln-Line Plus". Used NEW Remler Drum Dial. Because of the dial arrangement, it might be called the "Unicontrole Nine-In-Line". See Note 1. Might use the new "C-16" audio and "C-25" output audio.  Ad in H-C Catalogue, Late Summer '27, P68 at $74.95. S. Hammer Radio Co. offered it completely wired in a Corbett cabinet for $167.  Jewel may have designed Acme 5-Tube Reflex circuit.  7x26 inch engraved panel.  
      " "    "     "     "     "     "     "     "     " N28 Nine-in-Line  [AC or DC]   January 1928 BK 9 HFL Flat Rectangle X 37 Iron Air   "    "    " CRCB - January 1928 - P146 - Construction CRCB - January 1928 - P148 (See directly above)  AC version. 7x26 inch panel.
      " "    "     "     "     "     "     "     "     " HFL Model 10 Screen Grid Isotone - Custom Built   June 1, 1928 CB 10 HFL Flat Rectangle 450   "    "    " RSWC - October 1928 - P29 - Complete X CRCB - September 1928 - P54 - Lite Construction CRCB - September 1928 - P57 - Layout & Scheme June '28 issue of RLG, P151: "Will release on the First of June". No untuned, no tuned, 3 IFs, 3 Audio Push-Pull ^.  Six RF, 1 Osc., 3 Audio. $105.00 ^. Operates at 450 KC which makes the set an "absolute one spot receiver". IFs are in tall rectangular shielded cans. RSWC, Oct '28:  "Perfect 8 Kilocycles Selectivity."  "Manually tuned R. F. amplifier stages."  "Measured gain of 65 per stage". From 9/28 CRCB, "From Factory - Wired Units - In One Hour". Using only nuts and bolts, only ten wires to assemble.  Three stage "screened" grid RF amplifier. Can use a short 10 foot wire for an antenna which can be connected to the grid of the first RF amp.  List $195. Net $114.66. ABC Power Supply $55.86.  Isotonic Audio Amplifier $32.34.  Screen Grid version $35.28.  Westrad, Fall '28: "Uses 2-201A, 3-222 screen grid, 3-112A, and 2-171A tubes".  "Anyone can solder ten wires." This is how they get around RCA! Shown in the Allied, late 1928, but not early 1929.  Barawik Cat. Spring/Summer '29 - P100 $114.60 complete.
      " "    "     "     "     "     "     "     "     " Special Nine with the New 250 Power Amplifier   February 1929 CB 9 HFL Flat Rectangle 37 Iron Air "    "    " RN - February 1929 - P791 - Complete Screen-grid ^. No untuned, no tuned, 4 IFs, 3 Audio ^.  AC version $61.74 / DC version $55.86 / 250 Amplifier & B supply $45.28.  Barawik Cat. Sp/Summer '29 - P101 = DC model, Kit $55.86,  Factory assembled/wired $73.50.  AC model, Kit $61.74, Factory assembled/wired $79.38.  7x21 inch panel.
      " "    "     "     "     "     "     "     "     " Mastertone Laboratory-Made Receiver  (A-C)   September 1929 M 11 HFL   Impedance "    "    " CRCB - September 1929 - P151 - Completely Wired RN - December 1929 - P524 - Lite Construction X RN - December 1929 - P524 X "Completely Built, Wired and Assembled by H-F-L Engineers. Shipped Ready to Operate."  Five tuned screen grid IF stages and power detector with Push-Pull 245s. Also, RN, Oct '29, P375, Ready-To-Operate. RN,  Dec '29, P524, Circuit Details. Used one UX280 for power supply.  7x21 inch panel.   This is the last HFL in the decade: The Mastertone "Super 10" with Hopkins Band-Rejector System was offered Nov. 1930 per CRCB (Vol. 11, No. 4) for Nov. 1930.
    HFL - Citizens Radio Call Book n / a Citizen's Super 8 Using HFL Isotone IF Amp   November 1928 BK 8 HFL Flat Rectangle 37 Iron Air New York City CRCB - November 1928 - P69 - Construction CRCB - November 1928 - P71 Like a DC version of the HFL Model 10 Isotone. Three 222, 1-112A, 3-201A, and 1-UX250.
  X Hilco A. E. Hill Mfg. Co. Super Hilco-Dyne Kit X August 1924 K 7 7 - 201A or 199 7 x 28 2 3 N W A. E. Hill Mfg. Co. Tuna Can X 40 Air Air Atlanta RDI - September 20, 1924 - P10 - Kit X Although what was advertised was just the base kit, the information for the radio could be gleened for the ad info. All air-core kit tuned to 40KC / 7500 meters. Kit has 1-Hilco Oscillator Coupler, 1-Antenna Coupler [both available in Aug '24 - RN - P212], 1-Filter Coupler, 3-Intermediate Frequency Transformers, 5- Hilco Precision Fixed Condensers, 3- Hilco Handykins, 1-20 page Instruction Book with Blue Prints for $30. Full kit first advertised in September 1924. Good full page ad in PR Dec '24 - P53 (X).  See Algonquin Electric immediately below. Advertised variocouplers in 1923.
      "    "   "    "    "    "    "    " Hilco Oscillator & Oscillator Coupler   Spring 1926 P n / a n / a n / a n / a n / a n / a "    "    "    "    "    " Tuna Can X n / a n / a n / a "    "    " Standard Radio Co. Catalogue - Spring 1926 - P26 X These parts were advertised independently of a kit. $5.00 each.
      "    "   "    "    "    "    "    " Replacement Hilco IF Transformers   Spring 1926 P n / a n / a n / a n / a n / a n / a "    "    "    "    "    " Tuna Can X 40 Air Air "    "    " Standard Radio Co. Catalogue - Spring 1926 - P26 X These parts were advertised independently of a kit. Four matched Ifs at 40 KC for replacement in Ultradyne Supers. Includes four .0025mfd fixed condensers for $19.
      "    " Super Hilco-Dyne Nine   November 1927 BK 9 "    "    "    "    "    " Tuna Can X 40 Air Air "    "    " RN - November 1927 - P497 - Light Construction   RN - November 1927 - P497   This apparently is an update of the previous version. Not a very complete construction article. RN says "Details in a forthcoming issue." Same for RN - Nov '27. See P497.
      "    " Algonquin Electric Company, Inc. Super Hilcodyne Nine   December 1927 CB 9         Impedance & Iron   Fred A. Jewel       New York City RN - January 1928 - P721   RN - December 1927 - P625 - Construction   RN - December 1927 - P626   Used one set of Hilograd units (special) that appear to be tunable. Used three stages of TRF and then three tube Oscillator / Tuning circuit. Advertised as…"manufactured and distributed in Complete Sets, Chassis', Units, and Knockdown Kits."  This is contrary to the 1925 court order. Leo  Potter, President, Algonquin. Algonquin factory listed in Poughkeepsie, NY [RN Jan '27]  See HHill, A. E.
  X Hollister Lincoln Radio Corporation Hollister AC 8 Super X February 1929 CK 8  4 - 222,                3 - 201A,              & 1 - 171A 8 x 28 2 - Drum 2 N W Lincoln Tunable Tall Rectangular X Variable 350       to 550 Air Air William H. Hollister "   "   " CRCB - March 1929 - P5 - Kit X CRCB - March 1929 - P53 X CRCB - March 1929 - P55 X This radio is virtually identical to the Lincoln Model 8-80 One Spot.  Differences are the Antenna Coil lies horzontally on the Hollister and the two front panel poteniometers were set further apart on the Hollister. This radio used a standard hardwood cabinet and a "Finely Grained Walnut Bakelite (front) Panel", unlike the two tone metal cabinet & metal panel of the Lincoln 8-80.  Only one connection on Antenna Coil rather than the two (long & short) on the Lincoln 8-80. Four screen tubes (UX222) and four "Manually Tuned", "Lincoln 101" I.F. stages. Also Used 3 - 201A and 1 - 171A.  No untuned, no tuned, 3 IFs, 2 Audio ^. Used Lincoln 1 "102" Osc. Coil, 1 "103" Antenna Coupler, 4 "101" Tuned IF transformers, 1 "105" first AF transformer, 1 "106" second AF transformer, and 2 "104(L & R)" condensers. Kit: $92.65 ^.  Radio for July '29 has article & scheme on Hollister. Barawik Cat., Sp & Summer '29 says "Gain for first stage (audio) is 4.4, for second stage is 3.7. Range from 40 cycles to 5,000."  Used the Clough audio system as touted in CRCB of Nov. 1928. Covers 50 cycles to 7,000. Can use 15 foot indoor aerial, but ad says it can be used without any antenna at all!   William H. Hollister (designer) wrote the book, "The Secret of the Super".  Address: 329 South Wood Street, Chicago. Lincoln Radio Corporation also sold Silver-Marshall, Tyrman, Scott, and HFL superhets out of this address. Lincoln also made available a Hollister power supply; "AB 250" for $60 retail (see CRCB for March 1929 ad), which used a 381 tube.
    Holmes Holmes Electric Manufacturing Co. Holmes Air-Core RF Transformers  ??   June 1927 P n / a n / a Chicago RN - June 1927 - P1468 - "Product Review"  
    Holtzmark Wm. Holtzmark Super - Hetrodyne Model H.V.3 X [1926] BK 9 9 - 201A (7 x 28) 2 7 N (TL) Victoreen Tuna Can X 88 Air Air Charles J. Victoreen Wm. Holtzmark X St. Louis Custom-built Victoreen kit with replacement coil for the antenna coil. There's a small vernier on the upper left of the front panel to help one of the major tuning dials control the oscillator [I think].  The oscillator coil is fixed approximately 3.5 inches across. Modified to 9 tubes with push-pull using Thordarson transformers.  Says "Mfg by Wm. Holtzmark, St. Louis" at the center of the panel and "Super - Hetrodyne Model H.V.3" on the upper, right side. Owned by Jim Hill [mailto:slimjimwas@cox.net]
    Hopkins Portable Super-Het   August 1925 BK 8 Russel H. Hopkins RA - August 1925 - P13 - Article Seven 199 tube portable. 7x18 inch panel
    House of Coils, The Unique Coil Co. Type F - Super Heterodyne Oscillatior Coil   December 1924 P n / a New York City RDI - December 13, 1924 - P30 - Oscil. Coil Only  
    Humphries NIF Eight Tube Super-Heterodyne Receiver   October 1924 BK 8                         LeRoy E. Humphries       Atlanta     RDI - October 11, 1924 - P15 & 18 - Lite Construction   RDI - October 11, 1924 - P15   Called "The New Multitube Circuit". Article by Harry J. Marx.  Original circuit used peanut WE 215A "N" tubes, but article in RDI, Oct. 18, '24 shows how to use 201As & 199s.
   33     222 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
    Impedance Coupled - CRCB NIF Impedance Coupled Super-Heterodyne   (September 1927) CB [Note 1] This set is likely the same as the "Samson Impedance Coupled Super" below.
  X Imperial - Vistoreen NIF The Imperial Eight X (1925 or 1926) CB 8 8 - 201A 7 x 26 2 2 N TL or W Victoreen Vertical Tuna Can X 88 Air Air Charles J. Victoreen ??? Several of these have been found using the early Victoreen layout.  Owned by Ron Lawrence.  Second one in heavier case owned by Ricky Janis. Third on eBay in March 2007. Panel and parts layout are the same Victoreen. Panel markings only slightly different between two of them. No advertising found for this het.
    Imperial Imperial Radio Corp. Imperial   September 1926 BK Chicago RN - September 1926 - P290 - New IF Transformers "New transformers…perfectly tuned and matched to exact peak…"
  X Infradyne DX - Remler Radio Constructors Corp. Model DX 1928 Infradyne X July 1927 CK 10 [5 *****] 5-201A,               4-199,                      1-112 or 171 Copper Embossed Cabinet                     11 x 26 2 - Drum 3 1 - V W Remler Module X 3490 Air Air E. M. Sargent                   & L. C. Rayment Oakland, CA Radio - July 1927 - P66 & 67 - Two Pages of Features X CRCB - September 1927 - P131 - Construction X CRCB - September 1927 - P135 X Hybrid.  From H-C cat, Late Summer '27:  New Improved 1928 Remler DX Infradyne.  Used "New" Remler R. F. Amplifier with 3-ganged capacitor. Used "New" Silver Marshall 220 audio transformers.  "Described and specified in 'Radio', 'CRCB', & 'RLG'."  "Tubes used: 5-301As, 4-199s, and 1-112A or 171A. $105.75 complete." Same description in Haskin's Fall 1927 catalogue. S. Hammer Radio Co offered a completely wired version for $194.50 in Sept '27 [P4].   Super-Het circuit designed by Sargent 1926. "Radio Par Excellence".  Ten tube Super Het or five tube "local" (TRF) set. Used Remler #700 IF amp and a Remler #710 TRF amp.  RN - Nov '27 - P468 -Scheme / Information. RM - Dec '26 - P128 - Scheme.  Also see H-C Catalogue, Late Summer 1927, P55 and RN - Nov '27 - P468 -Scheme / Information, RM - Dec '26 - P128 - Scheme, and CRCB - Sept 1927 - P67 - 90% wired / Kit. Copper embossed cabinet was part of the kit.  A RN article for Nov 1927 says cabinet is 26 1/4 long X 8 high X 12 deep. Radio Constructor's Corp. was likely an assembly operation in Oakland for Gray & Danielson.  Also see Remler.
      "    "    "    "    "    " "    "    "    "    "    "    "    "    " Remler Units (1928 Infradyne)   November 1927 CK "   "   " "   "   " X "   " "   " "   " "    "    "    "    "    "    "    " CRCB - November 1927 - P227 - Parts  
      "    "    "    "    "    " "    "    "    "    "    "    "    "    " 1928 Infradyne   November 1927 CK        "   "   " "   "   " X "   " "   " "   "         "    "    "    "    "    "    "    " Alter's Catalogue - October 1927 - P55-???  [Note 2]            
      "    "    "    "    "    " "    "    "    "    "    "    "    "    " New 1929 Infradyne   Late 1928 CK 10 [5 *****]     Remler Module "   "   " X 3490 "   " "   " "    "    "    "    "    "    "    " Allied Catalogue - Late 1928 - P99 - Complete Allied, late '28: "Tubes used: 5-301As, 4-199s, and 1-112A or 171A. $107.30 complete".
    IRCO Independent Radio Corp. IRCO Type BK IF Transformers   March 1927 P 9 ??             IRCO       Air Air         Philadelphia RB - March 1927 - P531 - IF Transformer           "Independent Radio Corporation Precision Apparatus" trademark used in RB ad, April 27, P547. Used "five transformers before the audio stages".  Permits panel size 17x10 inches.
    Jaynxon Jaynxon Radio Laboratory Jaynxon Super-Heterodyne   July 1924 CB 8                                 New York City RB - July 1924 - P295ish - Complete / Kits / Parts           Used "GR Type 271 Pick Up" & "GR Type 268A Oscillation" transformers (made by Jaynxon) with the General Radio IFs.  7x30 panel. $175 complete. Note 27.
    Jefferson Jefferson (Long Wave) IF Transformers   August 1925 P n / a n / a Jefferson Rectangle   30   Chicago R - August 1925 - P49 - IF Transformer Only Jefferson #150 IFs and Jefferson #155 Filter. Harry Alter Wholesale Catalogue of Sept 1926 shows the transformer and two model numbers "3258" and "3259" (Alter's stock numbers) with the same info as follows: "The effective band width is 13,000 cytcles wide. To be used with C299 or CX299 (dry cell tubes) only"  "Long Wave 10,000 M, Input (30 K. C.) Each $1.98."  (Reference to two RF transformers as early as Feb '24 - PR)  Ad says: "Best specifies Jefferson IFs for his new Superheterodyne." Listed as parts for Midget Super in RR, Oct '25, P12 (See Radio Review below). Includes "Tuned" and "Untuned" IF transformers. See Best above. Also see Radio Owners Service Company below.  See Note 27.  Also called "150 L. W." $5.00  Address 501 South Green St. n RTD, Feb '25.
  X Jefferson - Best n / a  Best Modified Superheterodyne Shielded Model X (Fall 1925) BK 7 7 - 199 10 x 21 3 2 1 - V W Remler Cylindrical X 45 Iron Air Gerald M. Best X "    "    "    "    "    "    "    " RN - Note 21 X RN - Note 21 X Three-dial Super. The center dial on the front panel is connected to the variometer which varies the inductance of the antenna tuner. See Note 21. "All Wave". Used UV199s.Completely brass shielded. Could have General Radio 271, Jefferson 150, Silver Marshall 60 KC, and Baldwin-Pacific as Best says these are all shielded IFs. Remler NOT mentioned likely because I don't think they are shielded units.. Sub-panel is 16 gauge brass and is 7x16. Brass shields were used to sepaarate various sections of the radio inside the case.  Adapted to a long wire outdoor antenna. A hand-wound "loading coil" was used to compensate for various lengths of antenna wire starting at 75 feet.
  X Jefferson - Brush n / a Kodak Size Midget 45 K.C. Best Super X Spring 1925 BK 7 7 - 199 5 3/4 x 11 2 4 1 - V TL or W Jefferson Rectangle   30   Gerald M. Best X W. P. Brush, Designer San Francisco RR - October 1925 - P11 - Lite Construction   RR - October 1925 - P13   "Radio" magazine for 1925 (Month unknown, "First part of this year") has full construction article by Clinton Osborne. RR, May '25, list numerous brands of IFs for use in this radio. They must all be near 45 K.C.: Remler, All-American, Baldwin Pacific, Branston, Jefferson, Phenix, Receptrad, Silver-Marshall.  RR, Oct '25: Construction of untuned & tuned 45 KC IFs shown. Same construction info, woodcut pictures, and scheme in RN, "Superheterodyne" book. Operated on tuned loop, but there is a schematic of an adapter for use with a long wire antenna in RN, "Superheterodyne" book. See Note 21. Super small: 7 1/2 pounds sans batteries.
  X Jefferson - Radio Owners Service n / a Jefferson Superhet Eight PNF October 1925 CK 8 8 - 199 7 x 20 2 2 1 - V TL Jefferson Rectangle 30     "    "    " Radiocast Weekly - October 18, 1925 X A good way to help distinguish this kit from most is to see if it has one of these three General Radio Oscillation Coils:  # 277A, 277B, & 277C. Parts list recommended three small Benjamin tube sockets and five large Benjamin sockets. Recommended one Weston voltmeter. Used three Jefferson IFs. Could have Thordarson, All American, Lyric, or Karas audio transformers. Complete kit at $82.75 or $89.50 (special audios) sans cabinet and matched tubes at $2.50 each.  RSOC is addressed at 660 12th Street, Oakland.
    Jellicoe n / a Five Tube Super Receiver PNF April 17, 1926 BK 5 ** (201A) 7 x 20 2 NIF NIF PNF NIF NIF NIF Jasper Jellicoe RWI - April 17, 1926 - P6 - Article X RWI - April 17, 1926 - P6 - Scheme X Used two crystal detectors in place of both detector tubes.  Only says used shielded IF transformers.  7x20 inch panel.
    Jones NIF Versatile Superheterodyne   December 1926 CB 7 Leslie Raymond Jones, developer? RN - Dec 1926 - P663 / Jan 1927 - P?? - Construction RN -January 1927 - P?? See Jan '27 - RN for construction details. Used either UX199s or UX201As.
    Johnson NIF Eight Tube Super   May 1924 BK 8             (Homemade)           Leo Johnson                     Built by ham, Leo Johnson, 2CTG.  Coils under the panel look homebrew.
    Kardon Kardon Products Inc. Kompentrol - The Super Heterodyne   1924 M 8 Kardon Peter Kardon New York City Antique Radio Classified - April 1994 - P10 - History Kardon also built Carnival and Kardonstrip and, later, Diva, but Kardon quit. According tp Radio Retailing for August '25, Kardon was sued after he sold only ONE Super which was to a Westinghouse employee, but the suit was eventually dropped. All this from the article "The Kardon Radio Story" in ARC, April '94, researched and written by Mike Parker.  Became Harmon Kardon.
  X Kellogg Kellogg Switchboard and Supply Kellogg Superheterodyne Transformers X 1924 K n / a n / a Kellogg Rectangle X 45 Iron Air Chicago Montgomery Ward & Co. Catalogue - 1924 - P30 - Kit X "Iron core type, encased in a metal shell with a bakelite terminal board on top. Plainly marked nickel plated binding posts. Designed for use in sets of four consisting of three superheterodyne and one filter transformer.  Filter transformers designed to peak sharply at 45 kilocycles and superheterodyne transformers from 35 to 45 kilocycles.  Superheterodyne transformer $4.19. Filter transformer $4.19.  Postage, each, 6 cents extra." Address 1006 W. Adams St. in RTD, Feb '25.
  X Kleinfeld M. H. Kleinfeld & Co. 8-Tube Super-Heterodyne PNF May 1924 M 8 M. H. Kleinfeld New York City RWI - May 1924 - P28 - Assembled RWI ad says "Guaranteed…Assembled in beautiful Mahogany Cabinet. List price $225.00…$98.00 Net"  161 West 64th Street, NYC.
  X Klentz Klentz Radio Company Klentz Super-Heterodyne Kit X May 1924 K / BP n / a n / a n / a n / a n / a n / a n / a Klentz Tall Rectangle X 95 Air Air Chicago CRCB - Fall 1924 - P107 - Parts / Blue Prints CRCB - Fall 1924 - P106 - Layout First adverted "Oscillator Couplers", "Wave Changers", and "Transformers" in CRCB May 1924. No construction info. Slightly different shape to the IF case than later years.  IF cans same size and shape as Webster RF transformer in RN, April 1923.  Address 2324 North Sawyer Avenue in RTD, Feb '25. Only one stage of audio.
  X   "    " "    "    "    "    "    "    " Klentz Super-Heterodyne X Fall 1924 BP 7 7 - 201A 7 x 30 2 3 N L Klentz Tall Rectangle X 95 Air Air "    "     " CRCB - Fall 1924 - P107 - Parts / Blue Prints CRCB - Fall 1924 - P106 - Layout First advertised "Oscillator Couplers", "Wave Changers", and "Transformers" in CRCB May 1924. No construction info. Slightly different shape to the IF case than later years.  IF cans same size and shape as Webster RF transformer in RN, April 1923. Address 2324 North Sawyer Avenue in RTD, Feb '25. CRCB for March '27 says: "Hermetrically sealed, bakelite case, staggered windings, perfect matching. F-500 Transformer, $5.00. I-500 Transformer, $5.00. Set .00015 Matched Condensers, $1.50 per set of four."
      "    " "    "    "    "    "    "    " Klentz Super-Heterodyne   Fall 1925 BP       Klentz Tall Misshapen Rectangle X 95 Air Air "    "     " CRCB - Fall 1925 - P161 - Kit / Blue Prints Three IFs, Ocillator Coil and Filter [Both same shape same as IFs], and four matched capacitors.  Ad lists the blue prints available and shows a transformer cut-away. Different can shape from previous model, but the same as Qualitone, Chicago, Oct 1925. Oscillator coil appears the same also with both from Chicago. See Qualitone below.  Ratio is 2 to 1.  Bakelite cans.
  X Klentz - Citizens Radio Call Book "    "    "    "    "    "    " 100 K. C. Super-Heterodyne   March 1927 BK 8 8 - 201A 7 x 26 2 3 1 - V L Klentz Tall Misshapen Rectangle X 95 Air Air "    "     " CRCB - March 1927 - P59 - Parts CRCB - March 1927 - P134 - Construction CRCB - March 1927 - P136 - Layout & Scheme CRCB for March '27 says: "Hermetrically sealed, bakelite case, staggered windings, perfect matching. F-500 Transformer, $5.00. I-500 Transformer, $5.00. Set .00015 Matched Condensers, $1.50 per set of four."  Recommends the Fiat Loop antenna of Chicago.
      "    "    "    "    "    "    "    "    "    "    " n / a 100 K. C. Super   September 1927 BK               (Klentz)     100 Air Air         New York City [Note 1]           Says "Used Air Core transformers". Likely thjis is a Klentz.
   19      241 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
    Lacault R. E. Lacault, Inc. R. E. 29  All-Wave X April 1929 BK 6 + 2 + 2 3 - 201A,              3 - 222,  2 - 210,          & 2 - 281 7 x 24 2 N N W Lacault Small                             Horizontal Coils X 120 Air Air Robert E. Lacault X     New York City RN - July 1929 - Ad from estate of REL - Alice Lacault X RN - June 1929 - P1090 - Construction X RN - June 1929 - P1092 X [Use ad from RN - July 1929 - Ad from estate of REL - Alice Lacault and the one on Page 1130 in RN, June 1929.]  Complete construction info is shown in RN, July 1929. This is Lacault's last design; the first time his famous Ultradyne Modulation system used in conjunction with screen grid tubes. Introduced in RWI, Ap 6, 13, & 20, '29. RN text says he "labored to complete this, his finest design, explaining how weak he was in his last days". (He died March 12, 1929.) This set without the associated Push-Pull audio amplifier and the power supply unit looks like a simple six-tube TRF set with two single variable condensers. The P-P amp is AC driven, but the radio itself is battery operated!!  Used 3 - 222s and 3 - 201As. Used 1 SG tube in Modulator and 2 SG tubes with 4 tuned circuits making a bandpass filter for IFs. There are only two stages of IF, as such. The distinctive "tuna can" Ultraformers are NOT found here. Rather, these are simple coils of wire on standard bakelite tubes. You'll find four of these coils here. Lacault considered 120 KC as a "high IF". There are three large metal shield boxes found inside this set; the oscillator stage and the two IF stages. One of the coils is found in each of these boxes. The fourth coil is outside the boxes. Three tubes inside the three boxes with three outside.  RWI, Ap 20, '29, Cover & P12-13: Lacault RE29 Power Supply. Other RWI articles in early Ap '29 issues and Ap 27, '29 issue. See Madison, Phenix, Ray-Dee-Artcraft, R.E.L, Strobodyne, and Ultradyne.
  X Lacault / de Willy n / a Super-Heterodyne with Homebuilt IFs or RCA 1716 IFs X December 1923 CB 10 10 - 201A (24 x 18) 2 7 N W R. C. A. [General Electric] Misc X 60 Iron n / a R. E. Lacault & F. de Willy X New York City RN - December 1923 - P690 - Construction X RN - December 1923 - P690 - Scheme X F. de Willy & R.E. Lacault article from RN Dec. 1923. First reference to Lacault. It's a 10 tube super and built in three units, tuner-oscillator and first detector, IF amps, and the last detector with AF amps.  The three units stack on top of each other into a single enclosure. Oscillator coupling accomplished with with honeycomb or homebuilt coils. IFs could be either homebuilt coils or RCA 1716 transformers.  See Madison, Phenix, Ray-Dee-Artcraft, R.E.L, Strobodyne, and Ultradyne.
    Lake Radio Service Lake Radio Service HI-AMP Super Heterodyne Kit   October 1924 K n / a Chicago RB - October 1924 - P545ish - Kit "Assures success…Best for DX and selectivity…Includes four transformers, and oscillator coupler with complete constructional data $23-25."
    Lakeside Supply Lakeside Supply Company Microdyne Model 550-EM   March 1925 M 7 7 - 201A 7 x 18 2 2 N L Apex Short Cylindrical X NIF Air Air (E. K. Oxner) Chicago RN - March 1925 - P1658 - Manufactured Pictured is the "Apex Microdyne" in a grand (Desk ^) cabinet. $400.00 ^. RN, Mar. '25, says 2 RF, 2 audio, 2 detectors, and an oscillator. No untuned, 2 tuned, no IFs???, 2 Audio ^. See Microdyne & Stephen.
  X Langbein & Kaufman Langbein & Kaufman Superheterodyne Oscillator Coil X Fall 1924 P n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a NIF n / a n / a New Haven, Conn. CRCB - Fall 1924 - P52 - Coil Only X Note 27.  Numerous coils made by L & K.  Model "OC40" was the variable superhet oscillator coil. Hard rubber form with green silk wire. No infor found about frequency range.
    Langhorne Langhorne Radio Company Langhorne Super Heterodyne X 1927 or 1928 CB 8 8 - 201A (7 x 36) 3 5 N (L or W) Langhorne Large Vertical                Tuna Can X NF (Air) Air Thomas J. Langhorne Portland, OR Three-dial super. Gorgeous set! This appears to be factory assembled as the workmanship is superior. Information from Art H. Redman from Portland (8/05):  "I would of got back to you sooner but first I had to make a trip to the Mulnomah County Library to find some information. In 1923 Thomas J. Langhorne worked for the C.L. Boss Auto Company. The City Directories from 1924 to 1926 list the Thomas J. Langhorne and Company Radio Parts and Manufacturers at 316 Commonwealth Building. In 1927 and 1928  the Company is listed as the Langhorne Radio Company. The 1928 listing has a C.S. Finley as an associate. No mention of Langhorne. There is no listing in the 1929 City Directory. Therefore the company was in business only from 1924 to 1928. There are no articles mentioned in the indexes of the two Portland, Oregon newspapers the Oregonian and the Oregon Journal."  (Thanks, Art! Editor) The first RF stage is tunable with the first of three dials. Not a hybrid. Very long set with engraved panel, but no brand name.  Based on the tube sockets used on one of the only two sets known to exist, they were made in early 1925. Buit each IF says "Langhorne Radio Company" which places it in 1927 or 28. 
  X La Peer La Peer Electrical Mfg. Co. La Peer "D" Coil Essential Kit X November 1927 K n / a n / a Le Peer Vertical Tuna Can X NF Air Air Chicago CRCB - November 1927 - P165 - Kit   CRCB - November 1927 - P35 - Construction   CRCB - November 1927 - P135   "Essential Kit" consisted of one Oscillator and four RF transformers. Used "D"-shaped IF coil inside a moulded, moisture-proof bakelite case to reduce coupling effects. "D" coils were a new principle in late 1927. Two "D" coils face each other inside the case. Shown also in American Radio Co. Catalog #117, Pg 37, Kit Only, Nov 1927 [X]. Retail price was $27.50. American sold them for $16.50. Very small ad in RLG, June '28. Kit weighed five pounds.
      "    "    " "    "    "    "    "    "    "    "    " La Peer AR-9 Super X November 1927 CK 9   "   "   "     "   "   "    "    " X " " " "   "   " CRCB - November 1927 - P165 - Kit   CRCB - November 1927 - P35 - Construction   CRCB - November 1927 - P135   Based on the Le Peer "Essential Kit" & consisted of one Oscillator and four RF transformers. Very unusual as it used a double-detection in the second detector stage. Used "D"-shaped IF coil inside a moulded, moisture-proof bakelite case to reduce coupling effects. "D" coils were a new principle in late 1927. Two "D" coils face each other inside the case. Could be used with loop or outside antenna when used with the optional Le Peer "AC" coil, an additional $2.10. Shown also in American Radio Co. Catalog #117, Pg 37, Kit Only, Nov 1927 [X]. Retail price was $27.50. American sold them for $16.50. Called the "ER-9" and the "AR-9" in the same American catalogue. Very small ad in RLG, June '28. 7x24 engraved panel.
  X Lavoy - Remler Lavoy Lavoy Novodyne X (1925) CB 8 6 - 199 & 2- 201A 7 x 28 2 3 1 - V TL Remler Cylindrical X 45 Iron Air Gerald M. Best X Lavoy (California) Dale Davenport owns one now 0906. This brand was listed in an Estes Auction in 2004 and a model appeared on eBay in August 2005. eBay pix are from a seller in Oakland, CA.  Likely built and sold in California. Dales' had west coast stations on the Remler paper dials.  At least two of these have been on eBay in the last several years.
    Leroy Radio Shop, The  Leroy Super Heterodyne  ^   1924 CB 8 Sunnyvale, Ca. Three associated companies in Chicago, Long Beach, Ca., and Sunnyvale, Ca ^.  Echophone was sales agent for most of their output ^.  $175.00 ^
    Levy 60 K. C. Peanut Super Using Western Electric "N" Tubes   February 1926 CB 7 Morris Levy RN - February 1926 - P1140 - Construction RN - February 1926 - P1140 Small portable receiver. The RF transformers are in an enclosed unit (Silver Marshall "tub"???). Western Electric "N" tubes were used, but UV199s could be substituted. 7x10 inch panel. Only 4 1/2 inches deep!
    Liberty Liberty Mail Order House Reflexed Super-Heterodyne Kit  [Hanscom]   January 1925 CK 6 Allan T. Hanscom New York City RB - January 1925 - P542 - Kit Six tube refexed Super. 7x26 inch panel.  $138.11
    Liberty Electric Liberty Electric Corporation Super-Heterodyne Kit No. R-40   July 1924 K Liberty Electric Tall Cylindrical 57 Air Air Stamford, Conn. RN - August 1924 - P254 - Kit RN - Oct 1924 - P505: "Type 41 Input Transformer", "Type 42  IFs", Oscillator Pick-Up Coil, & a small, rectangular By-Pass Condenser furnished with Kit.  Air-core IFs at 5,200 meters.  Radio Age for Sept '24 P52 shows back of set and new factory. That issue says it comes "Complete". Used 17 inch loop.   "Knockdown" still listed in RTD, Aug '25.  RWI, July 26, '24: ...have purchased...new 35000 square foot modern factory.   RN ad ifor Nov, 1924, says "We are now filling an important United States Signal Corps super-heterodyne contract."  Panel is 8" x 28". 
    Liberty Transformer Liberty Transformer Co., Inc. Liberty Special Air Core Radio Frequency Transformer   November 1924 P n / a Liberty Transformer Air Air Chicago PR - November 1924 - P36 - IF Only  
    Lincoln Lincoln Radio Corporation Long 45 Tuner / Kit   January 1925 K Chicago PR - January 1925 - P64 - Kit / Parts CRCB ad for March 1929 says company "Established 1923".   Mentions kit at bottom of ad.  Mentions Oscillascope kit (See below). Also see Rex Laboratories, Inc.  
      "    "   "    "    "    "    "    " Lincoln Oscillascope Oscillator Coupler   November 1924 P n/a "   "   " RDI - October 31, 1925 - P?? - Part X Ad in RDI, Nov 29, 1924, P?? mentions Coupler.
      "    "   "    "    "    "    "    " Lincoln Superheterodyne   December 1926 CB 8 Silver Marshall Tuna Can Air Air "   "   " RWI - December 4 & 18, 1926 - P?? - Construction?? RWI - January 1, 1927 - P14 - Layout RWI in two issues, Dec 4 & Dec 18: Used the SM Type 221 and 220 audio transformers.May be same set in Silver-Marshall ad in RLG March 1927, page 20 lists this radio as using SM parts. Followup has good pix in RWI, Jan 8, '27, P14!  Also, may be same set in PR, May '27, P534, Parts, Layout, Scheme: Used 4 Lincoln air-core IFs.  Item in center of baseboard is a fixed inductor.  (See Lincoln pix in my "Gallery" - May have come from Cleveland. See pix.)
  X   "    "   "    "    "    "    "    " Lincoln 8-80 One-Spot Super X November 1928 CK 8  4 - 222,                3 - 201A,              & 1 - 171A (7 x 22) 2 - Drum 2 N W Lincoln Tunable Tall Rectangular X Variable 350       to 550 Air Air William H. Hollister "   "   " 1001 Radio Questions & Answers - Fall 1928 - P112 X CRCB - November 1928 - P58 - Construction   CRCB - November 1928 - P59   Four screen tubes (UX222) and four tunable "Lincoln 101" I.F. stages. Also Used 3 - 201A and 1 - 171A.  No untuned, no tuned, 3 IFs, 2 Audio ^. Used Lincoln 1 "102" Osc. Coil, 1 "103" Antenna Coupler, 4 "101" Tuned IF transformers, 1 "105" first AF transformer, 1 "106" second AF transformer, and 2 "104(L & R)" condensers. Kit: $92.65 ^.  Barawik Cat., Sp & Summer '29 says "Gain for first stage (audio) is 4.4, for second stage is 3.7. Range from 40 cycles to 5,000."  Used the Clough audio system as touted in CRCB of Nov. 1928. Covers 50 cycles to 7,000. Can use 15 foot indoor aerial, but ad says it can be used without any antenna at all!  Both long wire and short wire connections on Antenna Coil.  Westrad, Fall '28: Lincoln "112" Shielding Metal Cabinet, two-tone finish $5.44 ($9.25 retail). William H. Hollister (designer) wrote the book, "The Secret of the Super".  Address: 329 South Wood Street, Chicago. Lincoln also sold Silver-Marshall, Tyrman, Scott, and HFL superhets out of this address. Lincoln also made available two "B" power supplies; "101B" & "101ABC", used "bone dry rectifiers"  (see "1001 Radio Questions & Answers" Fall 1928 ad). Also see Hollister Model 8-80 One Spot. Identical radio except the Antenna Coil lies horzontally on the Hollister. Have a Riders schematic.
      "    "   "    "    "    "    "    " Lincoln 8-40 Super   September 1929 CB 8 Lincoln 475 Impedance "   "   " CRCB - September 1929 - P17 - Complete CRCB - September 1929 - P65 - Article CRCB - September 1929 - P66 Completely redesigned with 224 screen-grid tubes. Only three stages of tuned IF due to excess oscillations with four stages. Two Push-Pull 245s.  No integrated power supply. Does battery version have push-pull???  9 tube AC version with push-pull audio amp in 1930 ^.  Great explanation of impedance IF coupling in this issue Sept '29 CRCB.
  X Lincoln Quality Lincoln Quality Products Company Lincoln Quality Approved Products Superheterodyne X 1926 BK 8   2 3 N   Lincoln Quality Small Bakelite            Tuna Can X   Air Air Cleveland RWI - December 4 & 18, 1926 - P?? - Construction?? RWI - January 1, 1927 - P14 - Layout ?? Used 4 Lincoln Quality air-core IFs in middle, top of baseboard with the Oscillator Coil ("Fixt Inductance") in the center. Used the SM Type 221 and 220 audio transformers on each end of the baseboard. May be same set in Silver-Marshall ad in RLG March 1927, page 20 lists this radio as using SM parts.  Four potentiometer knobs spaced across the back of the baseboard. Jones-style multiplug in back center, with Magi's on top and Feldt's under baseboard. See Joe Magi's Lincoln Quality Eight.  Obvious Lincoln herald on literature that matched the Magi layout. Good Pix in RWI, Jan 8, '27, P14!   Also, may be same set in PR, May '27, P534, Parts, Layout, Scheme. Lincoln Quality was purchased by The Rex Laboratories, Inc. in September of 1927.    See Rex Labs. 
  X Lincoln Quality Rex Laboratories, Inc. Lincoln Quality "Standard of Comparison" Receiver X September 1927 n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a n / a Cleveland CRCB - September 1927- Disclaimer Ad X Rex Labs  of 341 The Arcade in Cleveland took over Lincoln Quality by Sept. '27. This ad in CRCB explains the use of the Lincoln Quality shield. "Standard of Comparison" Receiver mentioned in this ad.  See Lincoln Quality above.  Also see "Lincoln Radio Corporation" of Chicago.
  X   "    "    "    "    "      "    "    "    "    "    "    " Lincoln Quality "Standard of Comparison" Super Nine X November 1927 BK 9 7 - 201A,                1 - 112, & 1 - 171 7 X 26 2 2 N TL Lincoln Quality Small Bakelite            Tuna Can X   Air Air "    "    " CRCB - November 1927 - P204-205 - Two Page Ad X CRCB - November 1927 - P107 - Construction   CRCB - November 1927 - P107   This nine tube super is just a modification of the eight tube set of a year earlier. Many of the physical attributes are the same. There are two potentiometers on the back of the baseboard, for example, rather than the four on the Eight. One extra IF was added to make this set a nine tuber. Five air-core IFs used under-panel in this installation. The Oscillation Coil ("Fixt Inductance") found at the far right of the basebroad, looking from behind. Acme audio transformers ("Model MA-2") recommended here.  Lincoln Quality Products are owned by Rex Laboratories, Inc. at 341 The Arcade, Cleveland, Ohio.
  X Lincoln Lincoln Radio  REX?? Best Lincoln Nine   September 1927 K 9 7 x 24 Lincoln Gerald M. Best X Cleveland CRCB - September 1927 - P70 - Kit / Parts CRCB - September 1927 - P416 - Construction   CRCB - September 1927 - P144   CRCB ad shows "Zig Zag" loop antenna.  S. Hammer Radio Co offered wired with Corbett cabinet for $154.90 in Sept '27.  Used Lincoln Oscillator and 5 Lincoln Intermediate transformers.
    Locke Locke Radio Shop Sockets & Low-Loss Coils   November 1924 K 7 Victor, N. Y.  QST - December 1924 - P108 - Kit / Parts X Advertises seven socket sub-panel and coils for single or double control (dial) "Supers".  QST - Nov '24 says to mount Precise Multiformer under sockets and base panel which is 6 x 20 1/2 x 3/16 bakelite panel. 
  X Long - Remler Long Radio Works Model S - 8 X (Likely 1925) CB 8 8 - 199 7 x 24 2 3 1 - V TL Remler Cylindrical X 45 Iron Air Gerald M. Best X Les or George Long Cornelius, Oregon Remler parts.  Probably built by the "Long Radio Works" by brothers Les or George Long on the family farm on Rural Route 1 (later renamed "NW Long Road").  This location was 20 miles west of Portland, Oregon or 1 mile north of the town of Cornelius, Oregon.  They were in radio business from 1920 through the late 1930s.  Info from Art H. Redman email (Portland 8/05):  "Thanks for the pictures of the Long Superhet and Langhorne. I would of got back to you sooner but first I had to make a trip to the Mulnomah County Library to find some information. The Long Superhet looks different than most Long Battery sets than again its not a TRF. The blonde cabinet is unique. The dials appear to of the common type available dials in the late 1920s. There are no articles mentioned in the indexes of the two Portland, Oregon newspapers, the Oregonian and the Oregon Journal."  See Note 28.  See Remler.
    Lynch   Super-Het   April 1924 CB (8)                         Arthur H. Lynch                     Shown on page 23 of the April 1924 Radio Age.
  22           263 COMMON NAME MANUFACTURER / DISTRIBUTOR MODEL PIX FIRST OFFERED HOW OFFERED NUMBER OF TUBES TUBE TYPES FRONT PANEL SIZE MAJOR TUNING DIALS ADD'L PANEL KNOBS METER WIRE OR LOOP IF / FILTER MFG IF / FILTER SHAPES IF PIX IF PEAK          (KC) IF CORE FILTER CORE CIRCUIT DEVELOPER PIX BUILDER PIX WHERE DEVELOPED ADVERTISING PIX ARTICLE PIX SCHEME / PARTS LIST PIX                DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS                              DETAILS
    M. A. R. S. Manual Arts Radio & Electric Shop Six-Tube Super-Heterodyne   Mar-24 K 6                                 Los Angeles RJ - March 1924 - P144 - Complete Assemblies           Complete sets: All parts, less tubes, plus wiring diagrams and complete instructions $70.  Sam Scott, Manager
    M & H Moskowitz & Herbach M. & H. 8-Tube Super-Heterodyne X June 1924 CB / K 8 UV201A             or DV-2                or UV199 7 x (26) 2 3 N KL Moskowitz & Herbach Short Cylindrical X 50 (Iron) Air Philadelphia PR - November 1924 - P32 - Complete / Parts   Identify this set with three honeycomb coils on the front end [left rear of baseboard] and the Precision Selector [filter], a large black, horizontal Tuna Can near the audios. Used two choke coils near the Precision Selector. Superformer IF peak at 6000 meters (50 KC) for use with UV201A, C301A, DV-2, UV199, or C199. All parts are made from hard rubber. Ad in PR, Dec 1024 (X). Complete parts for 8 tube Super $96.50, Superformer $7, and Selector $10. An endorsement ad (PR, Dec '24) said he built a Super using the M & H parts "last June" (1924).  $96.50.   "Knockdown" and transformers still listed in RTD, Aug '25. Baseboard nearly 12 inches deep.  Address was 512 Market (no longer there), Philly  
    Madison Madison Radio Corporation Ultradyne Model L-2   June 1926 n / a Madison Tuna Can R. E. Lacault X "    "    "    "    " RN - June 1926 - P1691 - Complete Shock!  Is this the same Madison of Denver's Madison Moore?? See Lacault, Phenix, Ray-Dee-Artcraft, R.E.L, Strobodyne, and Ultradyne.
      "    "    " "    "    "    "    "    "    "    "    "    " Madison Multi-Chokes   January 1927 P n / a Madison New York City RN - February 1927 - P1053 -"Chokes" RN - January 1927 - P824 - Construction In RN, Jan '27, Carborundum Super Het, it indicates the use of Madison Radio Corp IFs & parts. Madison "Chokes" are used as IF transformers!  Was this Harry Madison gone to NYC?  See Lacault, Phenix, Ray-Dee-Artcraft, R.E.L, Strobodyne, and Ultradyne.
      "    "    " "    "    "    "    "    "    "    "    "    " Madison Ultraformers For Strobodyn   September 1927 P n / a Madison R. E. Lacault X "    "    "    "    " RN - September 1927 - P201 - Parts "Designed by R. E. Lacault"  See "Lacault", "Phenix", "Ray-Dee-Artcraft", "R.E.L", and "Ultradyne".
  X Madison Ultradyne LR-4 Radio Electric Laboratories /                                              Madison Radio Corporation Shielded Ultradyne LR-4 Siper-Radio   November 1926 CK 9   2 Madison (Chokes) Tuna Can X   n / a n / a R. E. Lacault,               A.M., IRE X "    "    "    "    " RN - November 1926 - P576 - Super Het Book RN - January 1927 -  P812 - Construction RN - January 1927 -  P813 RN - Jan '27 - P923: "Madison (Radio Corp.) Multi-chokes" for the LR-4. These can be used as the 4 IFs, although they look just like Phenix IFs as shown.  RLG - Mar '27 - P177: "Hammarlund Condensers & Coils" for the LR-4.  8x24 inch panel in H-C Summer 1927, $70.95. See Lacault, Phenix, Ray-Dee-Artcraft, R.E.L, Strobodyne, and Ultradyne.
  X (Madison Ultradyne Six) ^ Allen-Rogers-Madison ^ (Ultradyne Six) ^   1928 CK 6 (Madison) New York City $139.75 ^  I believe this Ultradyne was the first set made after Lacault sold the Ultradyne to Madison of New York.  Can the RE-29 (6 tubes) of April '29 be this?? See Lacault, Phenix, Ray-Dee-Artcraft, R.E.L, Strobodyne, and Ultradyne.
    Madison Moore Madison Moore Radio Corp. Madison Moore IFs   August 1925 K n / a n / a n / a n / a n / a n / a n / a Madison Moore Big Tuna Can 35 Air Air Harry Madison Denver R - August 1925 - P51 - IFs Only CRCB - March 1927 - P144  [Note 3] "The Finest Transformer in the World!"  Air-core units.
  X   "    "    "    "    " "    "    "    "    "    "    "    "    "    " Superheterodyne (201As) X February 19, 1926 BK 8 8 - 201A 7 x 28  2 3 1 -V                   & 1 - MA L Madison Moore Big Tuna Can X 35 Air Air Harry Madison "    " CRCB - Summer ?? 1926 - P66 - IFs Only X CRCB -  Summer 1926 - P67 - Construction X CRCB -  Summer 1926 - P71 - Layout & Scheme X CRCB introduced this set with blueprints dated February 19, 1926. Operated at 35KC [8575 meters].  Has "Unit" numbers 1 thru 5 stamped on coil labels. Unit 1 was the Oscillator Coil. I believe there were four different labels for the IF cans which may help date the radio. The first from August 1925 to February 1926 were stamped into the metal can.  The second series of labels from February 1926 to late 1926 were rivetted metal labels with the painted words "UNIT #" and a blank spot for the number to be painted on it. The third was similar to the second but a painted word "TYPE" was used and a blank spot was available for the letter & number. Lastly, from early 1927 until the shape of the IF changed in the Fall of 1927, on the 201A cans, the area that was left absent of paint before was filled in and the TYPE letter and number were both void of paint [reverse] across the bottom of the label. See picture examples. WHen the new higher frequency IFs came out in the Spring of 1927, the model numbers changed.  They had been "M-1" thru "M-5". IN 1927 they became "HW1" thru "HW5". These designated them as One Spot IFs. Located at 39th and Yates. 7x28 inch panel. 
  X   "    "    "    "    " "    "    "    "    "    "    "    "    "    " Superheterodyne (201As) X September 1926 BK 8 8 - 201A 7 x 28  2 3 1 -V                   & 1 - MA L Madison Moore Big Tuna Can X 92.5 Air Air Harry Madison "    " Randolph Radio Catalogue - Fall 1926 - P?? - Kit X IFs used with 201As had nickel bands around the ends of the can with dark centers. Used 5 IF/Filter cans. IFs operate at 92.5 KC according to Barawik Sept '26 and Randolph, Fall '26. Different circuits for 201As than with 199s.  Another small article & scheme: RN - Dec '26 - P680. Randolph, Fall '26: Kit only $62.50  Barawik: Sept '26, P20, complete, $114.60. Chicago Salvage, Nov '26, P6: $92.  7x28 inch panel.
  X   "    "    "    "    " "    "    "    "    "    "    "    "    "    " Superheterodyne (199s) X September 1926 CK 8 8 - 199 7 x 24 2 2 1 - V L Madison Moore Big Tuna Can X 92.5 Air Air Harry Madison "    " Randolph Radio Catalogue - Fall 1926 - P?? - Kit X CRCB - September 1926 - P103 - Construction   CRCB - September 1926 - P107   IFs used with 199 tubes had all nickel cases with metal labels attached. Used 5 IF/Filter cans. Different circuit used with 199s than with the 201As. IFs operate at 92.5 KC according to Barawik Sept '26 and Randolph, Fall '26. "As specified in CRCB (but) using UX199 tubes." Component layout is slightly different than the CRCB 201A version. Randolph, Fall '26: Kit only $62.50  Barawik: Sept '26, P20, complete, $106.60. Oct '26, P20, complete: $106.  7x24 inch panel.
      "    "    "    "    " "    "    "    "    "    "    "    "    "    " New One-Spot   January 1927 BK 8 Madison Moore Big Tuna Can 490 Air Air Harry Madison "    " RB - January 1927 - Back Cover - Transformer Only RN - December 1927 - P642 - Article CRCB - March 1927 - P144   (Note 3) IFs are "Type HWS". Duane Bylund discovered the IF peak at 490 KHz. IF transformers each have a bandwidth of about 30 kHz and they peak at 489 kHz, 503 kHz, 488 kHz, and 492 kHz, respectively. The filter transformer (HW-2) is physically much different than the other transformers but it has similar electrical characteristics. The gain on these transformer stages is about 1/3 of the gain of other sets I have measured (possibly due to the operation near 500 kHz with a 01-A tube – these transformers would probably work better with the type 199 tubes, or possibly even screen grid tubes). Radio News for December 1927 has scheme. By this time, their address was 2524 G Federal Boulevard. 7x26 inch panel.
      "    "    "    "    " "    "    "    "    "    "    "    "    "    " "One Spot" & "One Spot Batt'ry-less"   March 1927 BK Madison Moore Big Tuna Can 490 Air Air Harry Madison "    " CRCB - September 1927 - P23 - Kit / Parts One-Spot transformers used with batteries have Bakelite centers.  RB - Mar '27 - P501 - IF only. 
  X   "    "    "    "    " "    "    "    "    "    "    "    "    "    " AC International One Spot X September 1927 BK 9 + 3 2 - 199, 6 - 226,   1 - 227, 1 - 280,   1 - 171, & 1 - 874 7 X 28 2 - Drum 2 N TL Madison Moore Arched Aluminum X 490 Air Air Harry Madison "    " H-C Catalogue - Late Summer 1927 - P73 CRCB - November 1927 - P102 - Construction   CRCB - November 1927 - P103 - Scheme & Layout   The first two stages, used as untuned RF amps, were 199s. Used 6 - UX226s, 1 - UY227, all 1.5 volt AC tubes, and 2 - UX199s run on 1.5 volts AC, also. This set is designed for use with a specific power supply shown in the Nov 1927 CRCB. The PS schematic and layout is shown on page 105-106. It used two tubes [280 & 874] to develop the filament voltage [1.5 AC] as well as the B+ voltages. It also had an additional power audio stage that used a 171. New MM AC IFs that are flat on the bottom, arched on top, and aluminum. [The IFs for the battery set design was a special One Spot Tuna Can style.] Tyrman double-drum dial. CRCB Jan '28 has operating the International One-Spot.  H-C cat. Late Summer 1927 $73.10. 
    Madison Moore Calcatera Shielded Hyboy Superheterodyne   March 1927 CB 8 Madison Moore Tuna Can Air ?? Air ?? Joseph Calcaterra New York City RLG - March 1927 - P111 - Construction RLG - March 1927 - P113 Unusual design. Seven knobs, two meters, and two "Visi-dials" on front panel. Used Madison-Moore "One Spot" (HW-1 to HW-5) IFs.
    Magnaformer Radiart Laboratories Co. (Magnaformer 9-8  [D-C]  ^)   1926 ^ BK 8 or 9 Magnaformer Tuna Can 69.73 Air Air Chicago H-C Catalogue - Late Summer 1927 - P77 $200.00 ^.  No untuned, no tuned, 4 IFs, 2 Audio ^.  Magnaformer means GREAT CREATOR in Latin. IFs peaked at 69.73 KC (4300 meters).  H-C Catalogue, Late Summer 27, P77: "Specified in the CRCB…".   Used 8 - UX201As and one 112 or 171 power tube. Used the NEW Ferranti audio transformers. $76.95 complete. 7x26 inch panel. 
      "    "    "    " "    "    "    "    "    "    "    " Magnaformer 9-8  All Electric  [A-C]   (Spring 1927} BK 8 or 9 Magnaformer Tuna Can 69.73 Air Air "    "    " H-C Catalogue - Late Summer 1927 - P77 Used 8 - UX227 Acs and one 112 or 171 power tube. Used external B supply & SM 325 filament transformer. $76.95 complete. 7x26 inch panel. 
  X   "    "    "    " "    "    "    "    "    "    "    " Magnaformer 9-8 Model A-8 [D-C]                                                                               "Commander-In-Chief Of The Air" X September 1927 BK 8 or 9 201A,                   112, & 171 7 x 26 2 Drum 2 N Magnaformer Tuna Can 69.73 Air Air (J. M. Douglas) "    "    " Harry Alter Catalog - October 1927 - P57 - Complete X R - September 1927 - P16 - Construction CRCB - September 1927 - P106 Might have been developed by J. M. Douglas.  Model A-8 is complete kit.  Construction article by Gerald M. Best in Radio for Sept 27.  Construction also in CRCB - Sept 27 - P106. Four stages of IFs.  All 5 are air core.  Choose either 8 or 9 tubes with a front panel switch. Used 7 - 201As, 1 - 112 in 1st audio, & 171 in last audio. Schematic and info on P642, RN, Dec. '27.  PR, Sept 27, P197, ad, complete. American Radio Co, Catalog #117, Pg48, Sept 1927 (X).  Also shown in PR, Oct '27, P227 with advanced information, parts list, & empty schematic in PR, Sept 27, P128. Extensive construction article. Still shown in Nov '28 Nelson Electric ad (CRCB, P149).  Hammer Cat. Spr & Summer 29:  Complete Kit = $129.99, Wired with Corbett cabinet = $170.50. Loop operation.  7x26 inch Formica panel.
      "    "    "    " "    "    "    "    "    "    "    " Magnaformer 9-8 Model A-8 [A-C]                                                                               "Commander-In-Chief Of The Air"   November 1927 BK 8 or 9 Magnaformer Tuna Can 69.73 Air Air "    "    " CRCB - November 1927 - Page 6 - "9-8" Ad   CRCB - November 1927 - P128 - Construction CRCB - November 1927 - P128 "Commander-In-Chief Of The Air". "Great Creator of True Tone Quality". Choose either 8 or 9 tubes. 7x26 inch panel.
      "    "    "    " "    "    "    "    "    "    "    " Magnaformer AC-29   January 1929 K 10 AC222, 227, 281, & 250 7 x 24 Magnaformer Tuna Can "    "    " Barawik Catalogue - Spring & Summer 1929 - P116 - Complete CRCB - March 1929 - P152 - [Note 14] Used 2 - AC222, 5 - 227, 2 - 281, and 1 - 250 tube.  100% shielded.  A, B, & C power built-in which is one of the first for a Super, if not the first.  Barawik Cat., Sp & Summer 29, $108.72. Outside or loop antenna.  Panel is 7x24.    I believe they moved from Chicago to Cleveland around late 1929. 
    Magnaformer - Sutton n / a Flexible Nine-Tube Superheterodyne   February 1929 BK 9 Magnaformer Tuna Can 69.73 Air Air Coleman Sutton RN - February 1929 - P746 - Lite Construction RN - February 1929 - P747 The article's pictures show "Magnaformer" IFs, although no brand name parts are specifically mentioned. Huge panel 7x33.5 inches!
  X Marathon - Ultradyne Marathon Radio Marathon Ultradyne L-1 X April 1924 K n / a n / a n / a n / a n / a n / a n / a Marathon Tuna Can X 30 Air Air N. E. Borch San Francisco R - April 1924 - P91 - Kit X This is a Lacault Ultradyne L-1 knock-off kit.   "…parts designed and tested by N. E. Borch, internationally known radio engineer." "These sets are going like hotcakes."  Input and Oscillator coils look identical to Phenix coils. Transformers are black rather than the Lacault maroon.  Exactly the same ad was published in June of 1925 in Radio bu the price had gone up to $30!! Still listed in RTD, Aug '25.  Interesting the address [at 858 Pacific Building in San Fran.] in the ads is the same building as Baldwin-Pacific at 441 Pacific Building.  See Phenix Ultradyne L-1.
    Master Master Radio Supply Company Master Intermediate Frequency Module    January 31, 1925 K / P n / a n / a n / a n / a n / a n / a Master Radio Supply Co Rectangular      Module   60 Air Air Chicago Everybody's Radio Weekly [ERW]                                                           January 31, 1925 - P2 - Full Page Ad   Large rectangular block:  “Tuned Air Core Long Wave R. F. Transformer Unit. Has a filter and three IFs. “Tuned (not matched) to the same frequency…”. Hermetrically sealed.  “The Heart of the Master Super-Heterodyne”.  “Make the Master Your Servant and Master the Air”.  16 terminals on top of the box. One on the side. Used in the Sat., Jan 31, 1925 “Everybody’s Radio Weekly” [ERW]. $30.00. Master Oscillator Coil is a tall coil with 1 one large winding, 1 medium winding, & 1 small winding.  What appears to be a choke is called a resistor and is made specially by Master.  It’s part number 10.  Number 11 looks the same. Both under the panel. Used 3 foot loop. Has engraved and drilled panel and sub-panel. Appears to be a 7X30 inch panel.
      "    " Master Radio Supply Company Master Super-Heterodyne    January 31, 1925 BK 8 8 - 201A (7 x 30) 2 4 N Master Radio Supply Co Rectangular      Module   60 Air Air Chicago Everybody's Radio Weekly [ERW]                                                          January 31, 1925 - P3 - Lite Construction   Everybody's Radio Weekly [ERW]                                                          January 31, 1925 - P4 - Scheme & Layout   Large rectangular block:  “Tuned Air Core Long Wave R. F. Transformer Unit. Has a filter and three IFs. “Tuned (not matched) to the same frequency…”. Hermetrically sealed.  “The Heart of the Master Super-Heterodyne”.  “Make the Master Your Servant and Master the Air”.  16 terminals on top of the box. One on the side. Used in the Sat., Jan 31, 1925 “Everybody’s Radio Weekly”. $30.00. Master Oscillator Coil is a tall coil with 1 one large winding, 1 medium winding, & 1 small winding.  What appears to be a choke is called a resistor and is made specially by Master.  It’s part number 10.  Number 11 looks the same. Both under the panel. Used 3 foot loop. Has engraved and drilled panel and sub-panel. Appears to be a 7X30 inch panel.
    Maxum Maxum Electric Company Maxum Long Wave Transformer   Fall 1924 P Maxum Philadelphia CRCB - Fall 1924 - P177 - Parts "Type 1001 - 100 KC Air Core Interstage", "Type 1012 - 100 KC Filter Transformer", "Type 501 - 50 KC Iron Core Interstage", and Type 512 - 50 KC Filter Transformer". Maxum was "Successors to Fairmount Electric".  Transformers still listed in RTD, Aug '25.  
    Mayo Superheterodyne   July 1923 CB 10 R. R. Mayo Just a picture of Mayo and set.  No other info known.
    McCullah Efficient Super-Heterodyne   April 1924 BK 10 10 - 201A (7 x 30) 2 (4) N W n / a Duo-Lateral Coils     Air Air Arthur B. McCullah RA - April 1924 - P5 - Construction RA - April 1924 - P8   IFs are Duo-Lateral [honeycomb] coils = L100 & L400 . Has four stages of IF, thus ten tubes.  Built in three sections but one cabinet. Used Push-Pull audio amp. Improved schematic shown in Radio Age, June 1924, page 44. (X)  See immediately below.
  X   "    "    " Efficient Super-Heterodyne Improved PNF June 1924 BK 9 [or 10] 9 [or 10] - 201A (7 x 30) 2 (4) N W n / a Duo-Lateral Coils &       Variable Caps     Air Air Arthur B. McCullah RA - June 1924 - P44 - Scheme X IFs are Duo-Lateral [honeycomb] coils = L100 & L400 with the latter bridged by .0005 variable cap. This variable condenser tuned across IF secondary coil on each IF stage.  Built in three sections but one cabinet. Used Push-Pull audio amp. Says another stage of radio can be added, making four IF stages; 9 or 10 total tubes. Changes from first schematic: The IF's variable condensers are a June improvement. Change in the connection of the oscillator condenser. The rotary plates of the variable condensers are connected to the filament to off-set hand capacitance. First detector's plate has the same potential as its grid. Pencil Mark Grid Leak [PMGL] used in grid of second detector. Other changes not listed here.
      "    "    " Sure Shot Super-Het   February 1925 BK 9 9 - 199 & 201A (7 X 30) 2   n / a Duo-Lateral Coils &       Variable Caps   Air Air Arthur B. McCullah RA - February 1925 - P9 - Construction   RA - February 1925 - P10   The six honeycomb coils, which make up the IFS, are connected to three variable capacitors with dials at the back of the baseboard. The Tropodyne concept is similar to this. The whole radio is breadboarded with two front panels of different sizes. Used 7 - 199s and 2 -201As (audio out). The baseboard appears to be about 12x30 inches.
  X McDonald W. E. Fuetterer S. & S. Co. McDonald Superheterodyne X (1924) (M) 8 8 - 201A 8 x 36 2 7 N NIF McDonald Tall Cylindrical X 30 NIF NIF George W. Van Sickle St. Louis At first glance, this appears to be a Receptrad, but it is a McDonald. On each IF, it says "Distributed by W. E. Fuetterer S. & S. Co.".  Has four similar looking McDonald cylindrical IFs & filter.  Used white porcelain based tube sockets. Has seven Pacent rheostats across the front panel.  Taken from the eBay description:  "This radio was distributed by Van-Ashe Radio Co., 208-10 North 10th St. St. Louis, MO.  It was designed by George W. Van Sickle, Radio Engineer.  This unit featured Haynes-Griffin IF, Input Oscillator Transformer Components.  The IF is 30 KHz."  "It has 2 Faradon UC 487 capacitors.  It has Dubilier Mica Capacitors patented July 6th 1920.  It has 2 Remler gear driven tuning capacitors."  "I have a partial schematic & detailed description of operation of the radio that was in an advertisment in a St. Louis newspaper.  But this paper is in very poor condition."  Because of the newspaper ad, it might have been distributed by Van-Ash after the labels were put on the IFs.   It is 36" wide, 10" deep, & 9 3/4" tall. Sold 0205 on eBay for $307.
    McGown Radio Laboratory Best's 115 K. C. Super Parts   February 1928 K "    "    "    "    " R - February 1928 - P12 - Complete / Parts "D. B. McGown, Radio Laboratorian" took over "Radio" magazine's lab and appears to be the sales vehicle for Best's radios and others.
  X Melo-Heald Robertson-Davis Co., Inc. Melo-Heald Eleven X November 1926 BK 11 10 - 201A              & 1 - 112 7 x 28 2 4 1 -V                   & 1 - MA TL Melo-Heald Cylindrical X 125 Air Air Merwyn Heald Chicago American Radio Co.- Catalogue #117