Capehart-Farnsworth timeline 400 series tuner & amp. chassis

In progress ...

This article should show at last the overview about the different main parts that form a series 400 model. In fact this comprises also series 300, 200 and 100, the so called DeLuxe models with turn-over mechanism. We find so many offers for single chassis with either wrong or not known type name. Here I try to show each of the main chassis and its tube line up. This covers 1931 to 1950, the whole lifetime of this concept. For Rider's you find an overview about (eventially) all Capehart-Farnsworth related schematics in this link, chronological by Rider's volumes.

In the following links you find at last different threads for cabinets, Escutcheons/scales/knobs, record changers, tuner chassis and amplifier chassis, loudspeakers and pick-ups. For more or other information there is the general thread Capehart Radio-Phonographs for the 1930s and 1940s.

Capehart-Farnsworth timeline 400 series tuner & amplifier chassis

The series started for the season 1931/32 without "season suffix" and followed with A, B, etc.

 

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First saison: 1931/32 - no suffix

Capehart 400 series (2 unit construction)
Rider's Capehart Page 192-A or 1-1 for  for models 400, 401 and 402. Changer 16-E = ?

Tuner and Amplifier chassis:

Rider's Page 192-B: Pictural schematic for RF tuner chassis 8076.
Rider's Page 192-C: Pictural underside fo PZ amplifier chassis 8078.
Rider's Page 192-D: Wiring diagram between the components. For more information see the
"Overview about Rider's schematics for Capehart and Farnsworth-Capehart".

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A = 1932/33

Capehart 400A series (2 unit construction)
Rider's Capehart Page 4-1 to 4-3, copyrighted 1934. Changer 16-E-2 = ?

Tuner and Amplifier chassis: Tuning meter!

 

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B = 1933/34

Capehart 400B series (2 unit construction)
Rider's Capehart Page 4-2 and 4-3, Changer 16-E-2 = ?

Tuner chassis: Tuning meter!

Amplifier chassis:

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Capehart 300B series 8-tube tuner chassis, 6-tube AF amp chassis, 1 speaker 12", Broadcast only, Chamger 16-E-2 for 78 and 33.3 RPM, magnetic. No Aladdin possible. Total of 14 tubes.

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C = 1934/35 (Schematics missing! - is not W-839 but very similar)

It might be that my post "Variants for Capehart Series 400B, chassis changes" could be the missing schematics for the Capehart 400C series!

The same tuners were used in the 300 and 400 C series sets.

Capehart 400C series (Aladdin possible) Two chassis possible: BC only or Long Waves, Broadcast and Short Waves. Changer 16-E-2 for 78 and 33.3 RPM.

The 400CAW models, AW stands for "All Wave": (2 unit construction, total 16 tubes)

Tuner chassis with 8 tubes and Tuning meter:

Amplifier chassis with 8 tubes:

 

Capehart 300C series (no Aladdin possible) Two chassis possible: BC only or Long Waves, Broadcast and Short Waves. Changer 16-E-2 for 78 and 33.3 RPM.

The "All Wave" model came with a headphone jack and a switch to turn off the cabinet speakers so one could DX at night and not wake the family.  The 300C series have a small amplifier with a pair of 2A5 tubes and one 5Z3 rectifier.

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D = 1935/36

Capehart 400D series (3 unit construction) Tuning meter!
Rider's Capehart Page 7-4 and 7-5 (copyrighted 1936), Changer 16-E = 78 RPM.

Tuner chassis W-877, drawn Nov. 1935: IF = 465

Two AF amplifiers:
W-876 for 8 tubes from Nov. 1935: bass amplifier: 2 x 6F5 2nd AF, 4 x 6F6 output, 2 x 5Z3 rect.
W-868 for 4 tubes from Nov. 1935: treble amplifier: 6F5 2nd AF, 2 x 6F6 output, 5Z3 rect.
Aladdin remote possible. Speakers: 1 bass, two treble speakers.

Capehart 300D series (2 unit construction) 15 tubes (9 + 6) for LW, BC and SW, 16-E for 78 RPM, straight magnetic, Aladdin remote possible.

50D and 51D have chassis 300D series but no record changer, radio only.
60D and 61D have chassis 400D series but no record changer, radio only.

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E = 1936/37

Capehart 400E series (3 unit construction) 24 tubes
Rider's 10-7 & 10-8, W-890 from Sept. 1936 for tuner and W-892 for 5-tube treble amp.
Chassis are made by Howard Radio Company.
Where is the schematic for the 9 tube bass amp, probably W-891?

Tuner chassis:

Aladdin remote possible. Speakers: Bass 14", treble 12" with a has an exceptionally light and stiff cone for reproducing higher frequencies.
Model pages: Capehart 404E Chateau, 405E Chippendale, 406E Adam, 407E Neo-Classic/Modern, 500E Empire, the 1600E Plain Cabinet Concealed, 60E Modern and 61E 18th Century:

Two AF amplifiers,
W-891 for 9 tubes: 6C6, 2 x 6C5, 2 x 6F5, 2 x 6L6 push pull, 2 x 5Z3.
W-892 for 5 tubes: 2 x 6C5, 2 x 6L6 push-pull, 5Z3 rectifier.
Radio part No. 1957 is for 400 and 500 series E, 1960 is for 304 and 305 cabinets and No. 1961 for 50, 51, 60 and 61 cabinets.

Capehart 500E series (4 unit construction, 3 loudspeakers) 29 tubes (10+9+5+5). Added to the 400 series is one more treble amp and a 18" woofer.

Capehart 300E series (2 unit construction) 19 tubes (10 + 9), same tuner chassis, but only the 9 tube amplifier chassis and one loudspeaker.

Capehart 200E series (2 unit construction) 12 tubes (7 + 5) 7 tube tuner chassis plus the 5 tube amplifier chassis and also one loudspeaker.

50E and 51E have chassis 300E series but no record changer, radio only.
60E and 61E have chassis 400E series but no record changer, radio only.

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F = 1937/38

Capehart 400F series (LW, BC, SW) (3 unit construction), 23 tubes (12+7+4)
400-F tuner schem. 12 tubes: 2 x 6K7 RF, 6C5 osc, 6L7 mix, 2 x 6K7 IF, 6H6 det, 6G5 mag, 6J7, 6H6, 5Z4. IF 465 kHz, 4 gang tuning, 6 ZF filters, 4 bands. W-918 Aug. 1937.

400-F series treble amp N-919, 4 tubes: 6F6, 2 x 6L6, 5Z3 and 400-F bass amp N-920, 7 tubes: 6N7,2 x 6C5, 6F6, 2 x 6L6, 83. 3 LS outputs, 6 or 8 ohms? Two loudspeakers: 14" and 12". Aladdin remote posssible. Changer: True tangent, crystal.

Capehart 500F/FR series (4 unit construction) 27 tubes (12+7+4+4), 3 loudspeakers, 18", 14" and 12") Added to the 400 series is an amplifier F-M middle with seems to be the same as the treble amplifier. Added is also a 18" woofer.

Capehart 300F series (2 unit construction) 19 tubes (12+7), one LS 12", LW, BC, SW, changer 16-E)

Capehart 200F series (1 unit construction) 12 tubes, (BC and SW only, no changer, one chassis).  Fred Rice: "I have a 205F with the identical cabinet as the 305E but a with a 12 tube single chassis unique to the 205F."
Model 200-F schem. W-921, Aug. 1937, 12 tubes: 6K7 RF, 6C5 osc, 6L7 mix, 2 x 6K7 IF, 6H6, 6G5, 6N7, 6C5, 2 x 6V6, 5Z3, IF 465 kHz, 3 + 6 circuits, output for two LS but has only one speaker 12". See also changes 11-5.

50F, 51F, 60F and 61F cabinets.

 

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G = 1938/39

The first series 100 (only with 110G) was called Panamuse. From about season K, the drop type changer was introduced for (2 digit name) Panamuse and the models with the turn-over changer became the suffix "DeLuxe".

Capehart 400G series (3 unit construction), 23 tubes (8+11+4): Rider's 10-13 = W-947 (drawing date Oct. 1938) = 400G 8-tube tuner schematic: 6K7 RF, 6L7 mix, 6J5 osc, 2 x 6K7 IF, 6H6, 6G5 mag, 6J5 AFC. 465 IF, 3-gang tuner, 9 circuits. Page 10-14 = W-949 (Oct. 1938) 400G bass amp, 11 tubes: 6N7, 3 x 6C5G, 6F6G, 4 x 6V6G, 2 x 5Z3 and page 10-15 = W-948 400-G treble amp, 4 tubes: 6F6G, 2 x 6V6G, 5Z3.

Capehart 500G series (4 unit construction) 27 tubes (8+11+4+4) LS 18", 14", 12"

Capehart 300G series (2 unit construction) 19 tubes12" (8+11), LS 12", BC, SW, 16-E

Capehart 100G series (2 unit construction), Total 11 tubes (6+5). LS = 12". No Aladdin remote posssible.

Rider's 10-5 = W-940 (March 1938), 110G Panamuse schematic, tuner 6-tubes: 6K7 RF, 6A8 osc mix, 2 x 6K7 IF, 6H6, 6G5 mag., IF 465 for BC + 2 x SW. Amplifier 5-tubes: W-941, March 1938, signed G.F. Hofer: 6N7, 6C5, 2 x 6V6G, 5Z3.

The "R-3 Sheraton Record Cabinet" for $ 59 is belonging to the series 400G.

 

 

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H = 1939/40

Capehart 400H series (3 unit construction) 22 tubes (8+8+6) BC and SW, 2 LS:14" + 12", 16-E 78 RPM, true tangent crystal. Extended or Remote possible.

Capehart 500H series (4 unit construction) 28 tubes (8+8+6+6) BC and SW, 3 LS:18" + 14" + 12", 16-E 78 RPM, true tangent crystal. Extended or Remote possible.

Capehart 300H series (2 unit construction) 16 tubes (8+8), BC and SW, LS 12", 16-E 78 RPM, true tangent crystal. No remote possible.

Capehart 100H series (2 unit construction) 12 tubes (6+6), BC and SW, 2 LS 12" + 12", 16-E 78 RPM, true tangent crystal. No remote possible. This is a given number of tubes but the actual chassis is 14 tubes, 6 for the receiver, 8 for the amplifier.

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K = 1940/41

Capehart 400K series (3 unit construction), 30 tubes (12+9+9), 2 LS, 14" and 12".
Rider's 20-21 to 20-31: 400 Watts, 117 - 105-125 Volts AC 60 cycles.  Extended or Remote control possible., 16-E 78 RMP True Tangent, Crystal.
Rider's Farnsworth; Changer 16-E = Rider's RCD.CH. Farnsworth 19-11 to 19-44.

Tuner chassis:

Two type A-7 AF amplifiers of 9 tubes each:
Rider's pages 20-21 list, 20-28 schematic: 6J5 voltage amplifier, 6SC7 (metal) duo driver (shows the list on the same page where the tube lay out shows the 6C8G - which we carry on the model pages and is in the schematic),
4 x 6V6G push-pull-parallel output, 3 x 5Y3G rectifiers.

Capehart 500K series (4 unit construction) 36 tubes (12+9+9+6), 3 LS: 18" + 14" + 12". 16-E 78 RMP True Tangent, Crystal.

Capehart 100K series 2FM (2 unit construction) 20 tubes (11+9), 2 LS: 12" + 12", BC, SW and FM, 16-E 78 RMP True Tangent, Crystal. No remote control. See model 113K2FM.

Rider's Farnsworth; Changer 16-E = Rider's RCD.CH. Farnsworth 19-11 to 19-44.

Tuner chassis 100K-FM:

Amplifier "2"

 

Capehart 100K series 3FM (2 unit construction) 17 tubes (11+6), 1 LS: 12", BC, SW and FM, 16-E 78 RMP True Tangent, Crystal. No remote control. Same tuner chassis as K2FM - but see less powerful amplifier below.

Capehart 100K series 2 (AM) (2 unit construction), 15 tubes (6+9), 2 LS: 12" + 12", BC and SW, 16-E 78 RMP True Tangent, Crystal. No remote control.

Tube line up ?

Capehart 100K series 3(AM) (2 unit construction), 11 tubes (5+6 ?) (I think 12), 1 LS: 12", BC and SW, 16-E 78 RMP True Tangent, Crystal. No remote control.

 

The "R-4 Record Cabinet" for $ 59 is belonging to the 400K series.

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M = 1941/42
Capehart 400M series (3 unit construction, like the 400K series), 31 tubes (13 +9+9). Some did not count the magic eye and list 30 tubes!
Rider's Farnsworth 19-34 to 54; Changer 16-E = Rider's RCD.CH. Farnsworth 19-11 to 19-44.

Tuner chassis:

 

Has a mains transformer for the heaters, but gets the plate voltage from the amplifiers.
Sep. IF channels for FM for air core IF transformers for minimal drift and maximum gain.

Amplifier chassis 1 and 2 = 2 x A-10, each 9 tubes:

Loudspeakers:
12" treble electrodynamic (81-72)  with 450 ohm field, 8 ohm voice coil at 400 cycles.
14" bass electrodynamic (81-73) with the same parameters.
Baffle and cabinet design for high fidelity reproduction.

General:
Extended or remote possible. 400M series models are not adaptable for 25 cycle operation.
All of the desirable functions of the "K" series are also incorporated in the "M" series, but improved. The tuner has retained the motor driven selector switch to permit extended and remote control, separate bass, master and treble volume control, the latter being used in conjunction with a high fidelity switch.
New is the electric play control, improved broadcast and SW reception, superior FM performance with a squelch circuit to prevent inter-station noise. This is done by a 6SN7GT tube, one section bing used as an oscillator operating at 200 kHz and the other section is a grid controlled rectifier and controller of the squelch voltage applied to the first audio grid.
New design of the motor driven selector.
Improved push button setting of any desired frequency within the broadcast band.
The first audio stage is located in the tuner chassis including a bass and treble network. The audio amplifiers use inverse feedback for lowering the plate impedance of the push-pull-parallel tubes to contribute over-all noise and hum reduction.

The Capehart 16-E Record Changer has a play control feature for playing a determined number of records and then stop and shut off the instrument.
Capehart 16-E, fully automatic with record capacity of 16 to 18 records either 10" or 12", turntable speed 78 RPM (gear reduction unit),Pickup: Light weight Crystal unit with needle pressure of 1 1/4 oz., true tangent tone arm, electric play control unit. Heavy cast turntable for constant speed.
On page 5 is noted 20 records as maximum versus 16 to 18 in the specification on page 1. The explanation is that Capehart recommends 16 to 18 only because of variations in thickness and warpage, but nominal it is 20. Intermixed 10" or 12".

Capehart 100M series 2 (AM) (2 unit construction), 15 tubes (6+9), 2 LS: 12" + 12", BC and SW, 16-E 78 RMP True Tangent, Crystal. No remote control.

Capehart 100M series 2FM (2 unit construction) 20 tubes (11+9), 2 LS: 12" + 12", BC, SW and FM, 16-E 78 RMP True Tangent, Crystal. No remote control.

 

Capehart 100M series 3 (AM) (2 unit construction), 12 tubes (6+6)?, 1 LS: 12", BC and SW, 16-E 78 RMP True Tangent, Crystal. No remote control.

Capehart 100M series 3FM (2 unit construction) 17 tubes (11+6), 1 LS: 12", BC, SW and FM, 16-E 78 RMP True Tangent, Crystal. No remote control.

 

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N = 1945-48

Capehart 400N series (2 unit construction) 28 tubes (17 + 11) for the models 414N, 413N and 406N.

"400N has a single loudspeaker (from military-sponsored design to produce the best of sound-reproducing units. It is a two cone-unit. Both coils are driven by a 4 ohms voice coil. 5 pounds of alnico metal with a power capacity in excess of the 30 watts. The speaker needs a full enclosure not less than 2.5 nor more than 4 cubic feet with suitable absorbent material." Can you imagine that in the military "the best sound" was necessary?

"Radio & TV Retailing", January 1947 for the N chassis of series 400: "With 18.5 watts undistorted output. Changer handles up to 20 discs, 10" and 12" intermixed, plays both sides continously. Radio with 17 tubes. Separate amlifier unit has another 8 tubes. Auditorium type 15" low frequency speaker plus one horn type speaker for treble. Capehart units start at $ 965. This is for N3, not N2.

See Rider's Farnsworth 18-16 to 18-44 - without changer. 41-E 78 RPM, 16 records 10" or 12", Pickup = "Capehart True timbre".  External FM antenna with feeder of 300 ohms possible.

Tuner chassis N = 17 tubes for 400N and 100N: 
Travel-light dial. 400 series is a vertical scale, rest horizontal.

It seems that this was kept also for P - except the 2nd AM detection!
Rider's notes 15 tubes in the tube complement list (without naming the magic eye), omitting the 3rd FM IF amp. It calls the 6H6 for FM disc. in the layout instead of (2nd det) ratio detector.

Amplifier chassis 400N(1) series - 11 tubes (same as 400P) = 40 watts undistorted:

 

 

Capehart 100N series (2 unit construction) 25 tubes (17 + 8) for models 114N2 and 112N2.

The tuner chassis uses the same tubes as 400N sereies, the 8-tube amplifier chassis N2 has 2 x 6L6G as power output instead of 4 x 2A3 and no bias rectifier. Consumption is 225 Watts, 117 Volts, 60 cycles. 18 Watts undistorted power output for 8 ohms voice coil. Alnico two cone loudspeaker 15" and 5" coaxial. The combined voice-coil impedance of the 2 units is 8 ohms.

Turn-over record changer 41-E for 78 RPM curved, crystal for 400N and 100N series.

 

 

Panamuse N models (drop-down changer)

Rider's Farnsworth 18-39 shows an N3 amplifier with 7 tubes:
6J5 audio amp., 6J5 inverter, 2 x 6J5 drivers, 2 x 6V6G power output, 1 x 5U4G rectifiers. This is for the Panamuse 19N3 Sheraton. "Has a 81149 speaker, which consists of 12" bass speaker and 6" treble (alnico) speaker assembly." This means N2 has 15 + 6" and N3 has 12 + 6".

Models with N4 amplifier:

According to SAMS Photofact Folder Date 7-49, 4913-3, set 65, folder 3, the following 13 Capehart models were made by the Capehart division of Farnsworth Television and Radio Corp., Fort Wayne, Indiana and use the same chassis: 19N4, 24N4, 26N4, 31N4 with record changer P-63; 21P4, 24P4,  29P4, 30P4,  31P4 with record changer P-71 (Rider's); 114N4, 116N4, 116P4 (see video there) and 118P4 (see video there) with 41-E turn-over changer. Jensen 11 3/8" PM speaker ST-673 mod. P12-Q and built in 5" ST-589 mod. Q8-P coaxial within the big one - maybe only in "P" models.

 

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P = 1948-50 - last series

Capehart 400P series (2 unit construction) 28 tubes (17 + 11) BC, SW, FM. ? LS.

Data according to SAMS Photofact Aug. 1949, set 67, folder 6.

Tuner chassis: 

Amplifier chassis 400P series:

Capehart 100P2 series (2 unit construction) 25 tubes (17 + 8) BC, SW, FM. 2 LS: 15" + 5". The tuner chassis uses the same tubes as 400P sereies, the amplifier chassis has 2 x 6L6G as power output instead of 4 x 2A3 and no bias rectifier. Consumption is 225 Watts, 117 Volts, 60 cycles.

 

Capehart 100P4 series (single unit construction!)
 

Chassis:

 

Turn-over record changer 41-E - either for 78 RPM or for 78 RPM plus 33.3 RPM, both curved, crystal for 400P and 100P series.

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