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