Early Electronic Television
General Electric HM-171 and HM-185 Technical Information
| Television: Three channel (50-90 mHz) superhetrodyne. 5 inch CRT (5BP4) tetrode. Electrostatic focus
and deflection, approx. 30 degrees.
|
| Quan. | Type | ||
| Oscillator/Mixer | 1 | 6F8 | |
| Video IF Amplifier | 2 | 6AB7 | Video (9.5-12.75 mHz), audio (8.25 mHz) |
| Video IF Amplifier | 1 | 6AC7 | |
| Video detector/amplifier | 1 | 6F8 | |
| Video output/sync separator | 1 | 6F8 | |
| Horizontal (line) oscillator | 1 | 6N7 | |
| Horizontal (line) output | 1 | 6F8 | |
| Vertical (frame) oscillator | 1 | 6N7 |
|
| Vertical (frame) output | 1 | 6F8 | |
| Audio IF amplifier | 2 | 6SK7 | 8.25 mHz |
| Audio detector | 1 | 6H6 | HM-171 only |
| Audio detector/amplifier | 1 | 6SQ7 | HM-185 only |
| Audio Output | 1 | 6V6 | HM-185 only |
| Rectifier (HT) | 1 | 5U4 | |
| High Voltage (EHT) | 1 | 2X2 | 2500 VDC |