Museum Hours:

Saturday 10-6

Sunday 12-5

Early Electronic Television

RCA TRK-9 and Westinghouse WRT-702 Technical Information

 

Television: Five channel (50-90 mHz) superhetrodyne. 9 inch CRT (9AP4) tetrode. Magnetic focus and deflection, approx. 40 degrees.

 

Radio: Short Wave (7-22 mHz), Medium Wave (2.3-7 mHz) and Standard Broadcast (540-1720 kHz) bands.

 

Function
Quan.
Type
Notes
Television Chassis
Oscillator 1 6J5
Mixer 1 6AC7
Video IF Amplifier 4 6AB7 Video (9.5-12.75 mHz), audio (8.25 mHz)
Video IF Amplifier 1 6AC7
Video detector 1 6H6
Video amplfier 1 6AC7
DC restorer 1 6H6
Sync separator 1 6N7
Sync separator 1 6Y6
AVC 1 6F8
Horizontal (line) oscillator 1 6N7
Horizontal (line) output 1 6L6
Damper 1 5V4
Vertical (frame) oscillator 1 6N7
Vertical (frame) output 1 6J5
Audio IF amplifier 1 6SK7 8.25 mHz
Audio IF amplifier 1 6AB7 8.25 mHz
Audio detector/AVC 1 6H6
Radio Chassis
RF amplifier 1 6K7
Mixer 1 6A8
Oscillator 1 6J7
IF amplifier 2 6K7 455 kHz
Detector/AVC/audio amp 1 6R7
Audio amp 2 6J5
Audio Output 2 6F6
Tuning eye 1 6U5
Radio Power Supply Chassis
Rectifier (HT) 1 5U4
TV Power Supply Chassis
Rectifier (HT) 1 5T4
High Voltage (EHT) 
1
2V3 6000 VDC

Technical information