Early Electronic Television
RCA TRK-12 and Westinghouse
WRT-703 Tube List
Television: Five channel (50-90 mHz) superhetrodyne. 12 inch CRT
(12AP4) tetrode. Magnetic focus and deflection, approx. 40 degrees.
|
Radio: Short Wave (7-22 mHz), Medium Wave (2.3-7 mHz) and Standard
Broadcast (540-1720 kHz) bands.
|
Function
|
Quan.
|
Type |
Notes |
TV Chassis |
Oscillator |
1 |
6J5 |
|
Mixer |
1 |
6AC7 |
|
Video IF Amplifier |
4 |
6AB7 |
Video (9.5-12.75 mHz), audio (8.25 mHz) |
Video IF Amplifier |
1 |
6AC7 |
|
Video detector |
1 |
6H6 |
|
Video amplfier |
1 |
6AC7 |
|
DC restorer |
1 |
6H6 |
|
Sync separator |
1 |
6N7 |
|
Sync separator |
1 |
6Y6 |
|
AVC |
1 |
6F8 |
|
Horizontal (line) oscillator |
1 |
6N7 |
|
Horizontal (line) output |
1 |
6L6 |
|
Damper |
1 |
5V4 |
|
Vertical (frame) oscillator |
1 |
6N7 |
|
Vertical (frame) output |
1 |
6J5 |
|
Audio IF amplifier |
1 |
6SK7 |
8.25 mHz |
Audio IF amplifier |
1 |
6AB7 |
8.25 mHz |
Audio detector/AVC |
1 |
6H6 |
|
Radio Chassis |
RF amplifier |
1 |
6K7 |
|
Mixer |
1 |
6A8 |
|
Oscillator |
1 |
6J7 |
|
IF amplifier |
2 |
6K7 |
455 kHz |
Detector/AVC/audio amp |
1 |
6R7 |
|
Audio amp |
2 |
6J5 |
|
Audio Output |
2 |
6F6 |
|
Tuning eye |
1 |
6U5 |
|
Radio Power Supply Chassis |
Rectifier (HT) |
1 |
5U4 |
|
TV Power Supply Chassis |
Rectifier (HT) |
1 |
5T4 |
|
High Voltage (EHT) |
1 |
2V3 |
6000 VDC |
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