Early Electronic Television
General Electric HM-225/226 Technical Information
Television: Five channel (50-90 mHz) superhetrodyne. HM-225: 9 inch CRT. Electrostatic focus, magnetic deflection, approx. 45 degrees. HM-226: 12 inch CRT. Electrostatic focus, magnetic deflection, approx 50 degrees. |
| Quan. | Type | ||
| TV Chassis | |||
| Oscillator/Mixer | 1 | 6F8 | |
| Video IF amplifier | 2 | 6AB7 | Video (9.5-12.75 mHz), audio (8.25 mHz) |
| Video IF amplifier | 2 | 6AC7 | |
| Video detector | 1 | 6H6 | |
| 1st video amplifier | 1 | 6F8 | |
| Video output | 1 | ||
| Horizontal (line) oscillator | 1 | 6N7 | |
| Horizontal (line) output | 1 | ||
| Vertical (frame) oscillator | 1 | ||
| Vertical (frame) output | 1 | ||
| Audio IF amplifier | 6SK7 | 8.25 mHz | |
| Audio IF amplifier | 1 | 6B8 | |
| Audio detector, amplifier | 1 | 6SC7 | |
| Audio Output | 6V6 | ||
| Rectifier (HT) | 5U4 | ||
| High Voltage (EHT) | 1 | 2X2 | 4000 VDC |
| Radio Chassis (HM-226) | |||
| RF ampifier | 1 | 6SA7 | |
| IF amplifier | 1 | 6SK7 | 455 kHz |
| Detector/AVC | 1 | 6H6 | |
| Audio amplifier | 1 | 6SF5 | |
| Audio inverter | 1 | 6J5 | |
| Audio output | 2 | 6Y6 |