|
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.
|
|
|
Function
|
Quan. |
Type |
Notes |
| |
|
|
|
| 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 |
Service notes
Technical information |
