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Early Electronic Television
HMV 904/905 Marconi 706/707 Valve List
Television: Single channel superhetrodyne. 45.0 mHz video, 41.5 mHz
audio. The 904 uses a 5 inch CRT (Emiscope 3/1) triode and the 905
uses a 7 inch CRT (Emiscope 3/2). Magnetic focus and deflection,
approx. 45 degrees. |
Radio: Short (16-52 meters), Medium (200-550 meters) and Long
(750-2000 meters) wave bands.
|
Function |
Quan. |
Type |
Notes |
| |
|
|
|
| RF amplifier |
1 |
MSP4 |
|
| Oscillator/mixer (frequency changer) |
1 |
X41C |
37 mHz local osc. frequency |
| IF Amplifier |
1 |
KTZ41 |
Video (5.5-8 mHz), audio (4.5 mHz) and radio (456 kHz) |
| IF Amplifier |
1 |
KTZ41 |
Video and audio |
| IF Amplifier |
1 |
KTZ41 |
Video only |
| Video detector/amplfier |
1 |
MS4B |
|
| Sync separator |
1 |
KTZ63 |
|
| Horizontal (line) oscillator |
1 |
KTZ63 |
|
| Horizontal (line) output |
1 |
KT63 |
|
| Vertical (frame) oscillator |
1 |
KTZ63 |
|
| Vertical (frame) output |
1 |
KT63 |
|
| Audio detector and AVC |
1 |
MDH4 |
|
| Audio Output |
1 |
KT41 |
|
| Rectifier (HT) |
1 |
U52 |
|
| High Voltage (EHT) |
1 |
U17 |
2500 VDC |
|
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