June 1940 Radio-Craft
People old and young enjoy waxing nostalgic about and learning some of the history of early electronics.
Radio-Craft was published from 1929 through 1953. All copyrights are hereby acknowledged. See all articles
This Radio Service Data Sheet for the General Electric Model HJ-1205
floor console model vacuum tube radio came from the June 1940 edition
of Radio-Craft magazine, published by Hugo Gernsback. I post these
for the sake of hobbyists and historians searching for information
on vintage electronics. If you happen to own one of these radios,
whether in its restored or unrestored condition, please send
me a photo and I will be glad to post it here with attribution to
General Electric Model HJ-1205 Radio Service Data Sheet
Superheterodyne; A.C. Operation; 3 Bands (540-1,600 kc., 2,300-7,000
kc., 7,000-22,000 kc.); Power Output (undistorted). 8.5 W.; A.V.C.;
Tone Monitor; "Eye" Tube; Built-in, Rotatable "Beam-a-Scope" Antenna;
Dual P.M. Dynamic Speakers, 1 - 12 in. and 1 - 6 1/2 in.; 11 Push
buttons (Keys), including keys for Phono, or Television Audio Channel.
The model HJ-1205 is a 3-band A.C. operated receiver employing
12 General Electric pre-tested tubes in a superheterodyne circuit.
The receiver is equipped with 11 feathertouch tuning keys, 8 of
which may be set up for favorite stations. The 3 remaining keys
allow power control, manual tuning and phonograph or television
audio reception. Each model is also equipped with the new Super
Beam-a-scope; a highly efficient, self-contained antenna circuit.
Other features of design include: dual dynapower speakers (See "The
Use of Dual Loudspeakers," in this issue of Radio-Craft.), floodlighted
station-key finder, visual dial, iron-core I.F. transformers, automatic
tone compensation, automatic volume control, and push-pull output.
The Super Beam-a-scope is essentially a tuned coil antenna wound
on a frame and shielded by a Faraday screen against electrostatic
disturbances. This construction favors the desired signal over a
local man-made noise source in 3 ways. First, since any noise source
is composed of 2 components - electrostatic and electromagnetic
fields - the Super Beam-a-scope may be revolved so that a null point
is found where no voltage is produced from these 2 components. Due
to the fact that this null point is very sharp, it is very unusual
that any desired station will be in a direct line with the rejected
noise signal and thereby have its signal strength reduced appreciably.
In the second place, the Super Beam-a-scope eliminates the external
return path to ground present in the case of an unshielded antenna.
This reduces or eliminates local man-made noise sources in much
the same way as a shielded antenna lead-in does in an ordinary antenna
In the third place the Super Beam-a-scope discriminates against
the electrostatic component of an incoming wave in comparison with
the electromagnetic component, because of the Faraday shield. Since
the electrostatic component of a local noise source is a great deal
larger than the electromagnetic component, this rejection property
brings about an enormous increase in signal-to-noise ratio.
The above operation is only available on the broadcast band and
in this position the Super Beam-a-scope is also the 1st tuned grid
circuit. On the "C" and "D" bands, the Super Beam-a-scope is grounded
at the grid end thus preventing absorption spots due to loop resonance.
(See "How the Beam-a-scope Works," Radio-Craft, April 1939.)
Fig. 1. Location of trimmers and, Fig. 3, circuit of I.R.E. dummy
G.E. model HJ-1205 dual-loudspeaker receiver.
The voice coils are accurately and permanently centered at the
factory and should seldom give trouble. In case a voice coil needs
recentering it will be necessary to replace the entire cone and
voice coil assembly.
Note: In no case should the magnet be removed from the assembled
position without remagnetizing after replacing it.
Special Service Data
The following information will be found very useful in servicing
receivers if a vacuum-tube voltmeter or similar voltage measuring
instrument is available.
(1) Stage Gains‡
(a) Antenna post to converter grid Band "B" (Beam-a-scope connected)
*-3 V. at 1,000 kc.
Band "C" (Beam-a-scope disconnected) **-3 V. at 4 mc.
Band "D" (Beam-a-scope disconnected) **-3 V. at 18 mc.
(b) Converter grid to 1st 6SK7 grid, 30 at 455 kc.
(c) 1st 6SK7 grid to 2nd 6SK7 grid, 6 at 455 kc.
(d) 2nd 6SK7 grid to 6H6 det. plate, 70 at 455 kc.
(2) A 400-cycle signal of 0.04-V. across volume control will
give 1/2-W. speaker output.‡ (Volume Control turned to maximum)
(3) Average D.C. voltage developed across oscillator grid resistor
(R1) with gang closed.
Band "B" .......... 6.5 V.
Band "C" .......... 7 V.
Band "D" .......... 2.8 V.
‡Variations of +10%, -20% permissible.
*Use I.R.E. dummy antenna.
**Use 70 mmf. condenser between signal generator and antenna
Fig. 2. I.F. curves. A, sharp position; B, expanded position.
The alignment procedure is given in table form. Use the designated
"dummy" antenna in making each Individual alignment. The I.F. alignment
may be performed with the chassis removed from the cabinet and the
Beam-a-scope disconnected. The R.F. alignment on "C" and "D" bands
should be performed with the Beam-a-scope disconnected and a 70
mmf. mica condenser between the signal generator and the point of
Input. The R.F. alignment on "B" band should be performed with the
chassis and Beam-a-scope mounted in the cabinet and properly connected.
I.F. Alignment with Oscilloscope*
I.F. Alignment with Output Meter*
*Use "dummy" antenna consisting of 0.05-mf. condenser between
signal generator and point of input.
** Use a "dummy" antenna consisting of 70 mmf. condenser between
signal generator and point of input with "Beam-a-scope" disconnected.
*** Use an I.R.E. "dummy" antenna as shown in Fig. 3 between
signal generator and the point of input.
Fig. 4. Normal socket voltages.
C3 "C" Band ant. trimmer
C4 "D" Band ant. trimmer
C5"B" Band osc. trimmer
C6 "C" Band osc. trimmer
C7 "D" Hand osc. trimmer
C8 "B" Band padder
C9 0.0016-mf. mica
C10 0.0043-mf. mica
C11 750 mmf. silvered mica
C12 150 mmf. mica
C13 0.1-mf. paper
C14 47 mmf. mica
C15 01.-mf. paper
C18 47 mmf. mica
C19 0.05-mf. paper
C23 0.05-mf. paper
C24 100 mmf. mica
C25 41 mmf. mira
C26 0.01-mf. paper
C27 470 mmf. mica
C28 0.01-mf. paper
C29 0.05-mf. paper
C31 0.01-mf paper
C32 0.003-mf. paper
C34 47 mmf. mica
C35 0.05-mf paper
C36 0.05-mf. paper
Q37a 20 mf. 25 V. dry elec.
C37b 20 mf. 300 V. dry elec.
C37c 20 mf. 300 V. dry elec.
C37d 40 mf. 350 V. dry elec.
C38 0.01-mf. 1,000 V. paper
C42 0.01-mf. 1,000 V. paper
C43 7-65 mmf. ant. trimmer
C44 7-65 mmf. ant. trimmer
C45 20-180 mmf. ant. trimmer
C46 20-180 mmf. ant. trimmer
C47 20-180 mmf. ant. trimmer
C48 100-490 mmf. ant.trimmer
C49 100-490 mmf. ant.trimmer
C50 100-490 mmf. ant.trimmer
C51 0.1-mf. paper
C54 0.05-mf. paper
L2 "C" Band ant. coil
L3 "D" Band ant. coil
L4 "B" Band osc. coil
L5 "C" Band ant. coil
L6 "D" Band ant. coil
L7, 8 Tuning coils (no code)
L9, 10, 11 Tuning coils (code-red)
L12, 13, 14 Tuning coils (code-blue)
R1 22.000 ohms, carbon
R2 1. meg. carbon
R3 6,800 ohms, carbon
R4 47,000 ohms, carbon
R5 330 ohms, carbon
R7 1,000 ohms, carbon
R8 47,000 ohms, carbon
R9 0.22-meg. carbon
R10 47,00 ohms,carbon
R1 2.2-megs., carbon
R12 470 ohms, carbon
R13 2 megs. vol. con.
R14 0.15-meg., carbon
R15 3,300 ohms, carbon
R16 47,000 ohms, carbon
R17 0.15-meg., carbon
R18 47,000 ohms, carbon
R19 3,300 ohms, carbon
R20 1.5-megs., carbon
R21 0.27-meg., carbon
R22 0.22-meg., carbon
R23 0.22-meg., carbon
R24 100 ohms. 3.4 W. wire-wound
R25 2,400 ohms, or 3,300 ohms 2 w. carbon
R26 2.200 ohms, 2.6 W. wire-wound
R27 56 ohms, carbon
R28 100 ohms, carbon
R29 47,000 ohms, carbon
R30 1 meg., carbon
R32 5.6 megs., carbon
R3 1,000 ohms, carbon
R34 1,000 ohms, carbon
R40 33 ohms, carbon
R41 4.7 megs., carbon
R43 0.2-meg., carbon
R44 0.15-meg. carbon
R45 2,200 ohms carbon
P1, 2 Pilot lights, Mazda No. 44
S1 Ant. band switch
S2 Osc. band switch
S3 Tone switch
S4 Phono switch
S5 Power switch
S6 Manual switch
S7 Ant. section touch tuning switch
S8 Osc. section touch tuning switch
Radio Service Data Sheets
These schematics, tuning instructions, and other data are reproduced from my collection of vintage
radio and electronics magazines. As back in the era, similar schematic and service info was available
for purchase from sources such as SAMS Photofacts,
but these printings were a no-cost bonus for readers. There are 187 Radio Service Data Sheets as of
May 2, 2017.
- Radiola "28" Super and "104" Power Speaker
- Sonora Model TW-49
Models 1020, 1120, Series 10
- Air King Model 4604D
- Sparton Models 526, 526X, 526PS
- Truetone Model D2624
- Admiral Models 6EI, 6EIN
- Detrola Models 571A, 571B
- General Electric Model
- Howard Model 920
- Colonial Model 652 5-Tube Broadcast-Short-Wave
- Fairbanks-Morse 9-Tube
All-Wave Model 91
- International Model
500 5-Tube Dual-Range Battery
- Emerson Model 678 "Auto-Dynamic"
Nos. 230 and 231 Series
- Atwater Kent Model 649
- Howard Model
G-26, and "Airplane 4" Model AA25
Ward "Airline" Series 7GM 7-Tube High-Fidelity Receiver
- RCA Victor Model T5-2 5-Tube,
2-Band A.C. Superheterodyne Receiver
- Majestic "Models
50," "51" and "52"
- Bremer-Tully Model
7-70 and 7-71
- General Electric
Model M-49 4-Tube Radio-Phonograph Dual-Wave Superheterodyne
- RCA-Victor Radiola "Superette"
Model R7 Superheterodyne
- Crosley Model AC-7 and AC-7C
- Westinghouse "Columnaire"
Models WR-8 and WR-8-R (Remote Control)
- Characteristics of
Metal Tubes - and Other "Octal" (8-Prong) Base Types
- Kolster K20, K22, K25, K27 and K37
Nos. 62 and 63, 8-Tube High-Fidelity Chassis
- RCA Model 103, 4-Tube A.C. Compact
- FADA "Special" Model 265-A
and FADA "7" Model 475-A
- General Electric Model
C-62 6-Tube Battery
- Emerson 5A Automotive
- Zenith 666 Automotive
- Motorola 100 Automotive
- Crosley Roamio 4-A-1
- American-Bosch 524A
- Crosley Model 1316 (in Model
- RCA Victor "High-Fidelity Electrola,"
- AMRAD Model 81 ("Bel Canto"
- Fada 103 Fadalette,
Stewart-Warner Series 108, DeWald 54 Dynette Sets
- RCA Victor R-27 and Philco
53 Ultra-Midget A.C.-D.C. Radio Receivers
Models Fairfax and Sheffield 8-Tube
- Stromberg-Carlson No.
29, 9-Tube Superhet
- International Kadette
Model 400 4-Tube Battery-Operated Superhet
- RCA Victor Model 5M 5-Tube Auto
Model 11 Short-Wave Converter
- Silver-Marshall Model
727-DC Battery-Operated Superheterodyne
- RCA Victor Model VHR-307
Home Recording - Phono-Radio Combination
- Delco 32-Volt
Radio Receiver Chassis Models RA-3, RB-3 and RC-3
- Majestic Chassis Models
380 A.C. T.R.F., and 400 A.C.-D.C. Superheterodyne
- General Motors S1A, S1B
- Admiral Model 7C63, Chassis
- Westinghouse Model H-133
- Arvin Models 150TC, 151TC
- Kadette Model 90 Duplex
- RCA-Victor "Magic
Brain" Model 281
- Grunow 11A Chassis 11-Tube
Sears, Roebuck & Co., Silvertone "Rocket" Models 6110 and 6111
Electric Model GD-52
Models 6D302, 6D311, 6D326, 6D336, 6D360
Allied Radio, Knight Model E10913
- Arvin Model 140P
- Emerson Models 501, 502, 504
- Crosley Model 56TD-W
- Hoffman Model A500
- Stewart-Warner Model
- Zenith Models 6D014,
- Coronet Model C-2
- Sparton Models 7-46,
7-46PA, 8-46, 8-46PA
- Stewart-Warner Models
9001-C, D, E, F
- Zenith Models 5D011-5D027
- Bendix Models 636A, C, D
- ECA Model 108
Model 66 and 666, 6-Tube Superhet
- Ford-Philco Radio,
Model FT9, 6-Tube Auto-Radio Receiver
- Howard Explorer Model W Deluxe
19 Tube All-Wave Superhet
- RCA Victor Portable Table
Electrola Model R-95
- Atwater Kent Model 305Z
5-Tube 32 V. D.C. Superhet
- Kadette Jewel Model 40 Chassis
3-Tube Ultra-Midget Receivers
- General Electric Model
N-60 6-Tube Auto Superheterodyne
- Sparton Model
40 6-Tube T.R.F. Automotive Receiver
- Clarion "Replacement"
Chassis, Model AC-160 A.V.C. Superheterodyne
- Emerson Models 20A and 25A
- General Electric K-40A
- Pilot Model B-2
- RCA-Victor Radiola Model
M-30 Automotive Radio
- Motovox Models 10A All-Electric
and 10E Battery-Operated "Moto-Tetradynes"
- Kennedy Superheterodyne
- RCA Victor Model R-78 B1-Acoustic
- Philco Model 15 Series,
11-Tube Superheterodyne Chassis
- Zenith Challenger Model
Electric Models G-105 and G-106
- Silvertone "F," "FF," "G," "H," and "J"
Stewart-Warner Model 03-5A1 to 03-5A9 (Chassis 03-5A) Senior Varsity Radio
- Radiola Models 61-6, 61-7
- Westinghouse Models
H-104, H-105, H-107, H-108
- Farnsworth Models EC-260,
EK-262, EK-263, EK-264, EK-265
- United Models 980744,
(R-127 Chassis) Models 1271 to 1279 All-Wave
- ERLA Model 4500 Dual-Wave T.R.F.
4-Tube A.C. Receiver
- Clarion No. TC-31 5-Tube A.C.-D.C.
- Detrola Model 105C 5-Tube Dual-Band
- Zenith 6-Tube All-Wave Chassis
- RCA Victor Model 261, 555
to 107 Meter
- Philco Model 38-116; Code
"Ferrodyne" Chassis Model R-136
- American-Bosch Model
43OT 5-Tube 3-Band Superheterodyne
- RCA Victor Model C9-4 9-Tube
- Kennedy "Model 826B" Combination
- Steinite 50-A and 102-A
- Pilot Model 63 All-Wave 6-Tube
- Stromberg-Carlson No.
69 4-Tube All-Wave Superhet. Selector (Converter)
- RCA Victor Model 102 4-Tube
A.C.-D.C. T.R.F. Receiver
- Bosch Models 60 and 61
- Atwater Kent Models
30, 33, 35, 48 and 49
- Crosley Model 120 Senior Superheterodyne
- Columbia Screen-Grid
- General Electric
Models A82 and A87, 8-Metal-Tube All-Wave A.C. Superhet.
- Colonial 31 and 32 D.C.
- Zenith 5-Tube Triple-Wave Chassis
nos. 5508 and 5509
- Remler Model 46 ("Scottie")
- General Electric FA-60
- Stewart-Warner Series
- Howard Model B-5 (715),
Series 1 and 2 (Sheaffer Radio-Clock-Pen Desk Set)
Car-Radio Models F-1440 and F-1442
Model 31 Combination Radio and Panatrope
- Emerson Models 38, 42 and 49, 6-Tube
Dual-Wave (Chassis U6)
Motors Chevrolet No. 601574 Automotive
- RCA Victor M-104
(and M-108) Automotive
- Arvin-Ford 17-A Automotive
- Westinghouse Model WR
207 & WR 208 5-Tube Dual-Band Superheterodyne
- Radiolas "Super VIII" (AR-810,
"Semi-Portable" (AR-812), 24 and 26
- Howard Model 45 A. V. C.
- Majestic Model 25
Motorola Model 61
- Arvin Model 6
- Admiral Models 7T06, 7T12
- Garod Model 5A1
- Hoffman Model A301
Model E10716 Battery Portable
- Arvin Models 555, 555A, 552N, 552AN
- Grantline Models 605, 606
- Truetone Model D2616
- Belmont Model 5D128
- Arvin Models 444, 444A
International Kadette Model 1019
Models 97-561 to 97-569
- General Electric Model 280
- Zenith Models 5R080, 5R086
- Truetone Models D1747, D1748
Roamio Automotive T.R.F. Models 90, 91, 92
Roamio Automotive Superheterodyne Models 95, 96
- Emerson Model AZ-196
- Belmont Model 5P19
- Crosley Model 56FC
- Emerson Models 507,
509, 518, 522, 535
- Garod Model 6AU-1
- General Electric Models 219,
"Chairside" Model 567
Model 408 Battery "Farm"
- Wards Model 74BR-1055A
- Farnsworth Models EK-081, EK-082,
- Philco Model 200-X Radio
Admiral "Aeroscope" Models 161-5L, 162-5L and 163-5L
- Philco Model 59, 4-Tube A.C.
- Zenith Farm Model 6V 27,
- Ward 10-Tube All-Wave High-Fidelity
Superhet, Series ODM
- Philco-Packard Deluxe
- Canadian Westinghouse
- Crosley Model 1155
- Philco Models 39 and 39A
- Arvin Model 35
- Hetro Air-Ace Series M
- Westinghouse Models H-161, H-168,
- Garod Model 5A4
- Arvin Models 152T, 153T
- Belmont Model 5240
- Mantola Models 92505, 92506
- General Electric Models 102,
102W, 107, 107W, 114, 114W, 115, 115W
- Crosley Model 555 (A.F.M.)
- Crosley Model 515 (Fiver)
- Crosley Model 425 (Travo)
- Fairbanks-Morse Model
81 "Farm" Set
- Clarion Model 423, 470, 471, 472,
Radio Corp. Model 90
- Belmont Model 578 Series A
Posted April 28, 2015