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 |
|
