Museum Hours:

Saturday 10-6

Sunday 12-5

Early Electronic Television

RCA TT-5, RCA TRK-5, Westinghouse WRT-700 and WRT-701 Tube List


Television: Five channel (50-90 mHz) superhetrodyne. 5 inch CRT (5BP4) tetrode. Electrostatic focus and deflection, approx. 30 degrees. The TT-5 amd WRT-700  have only low level audio output.


Radio (TRK-5 and WRT-701 only): Short wave (7.0-22  mHz), medium wave (2.3-7.0 mHz), and standard broadcast (540-1720 kHz) bands.


Television Chassis

Quan. Type
Oscillator 1 6J5
Mixer 1 6AC7
Video IF amplifier 2 6AC7 Video (9.5-12.75 mHz), audio (8.25 mHz)
Video IF amplifier 1 6AB7
Video detector 1 6H6
Video amplfier 1 6V6
Sync separator 1 6N7
Horizontal (line) oscillator 1 6N7
Horizontal (line) output 1 6F8
Vertical (frame) oscillator 1 6N7
Vertical (frame) output 1 6N7
Audio IF amplifier 1 6AB7 8.25 mHz
Audio detector/amplifier 1 6B8
Rectifier (HT) 1 5V4
High Voltage (EHT) 
879 2500 VDC

Radio Chassis (TRK-5/WRT-701 only)

Oscillator/mixer (frequency changer) 1 6A8
IF amplifier 1 6K7 455 kHz
Detector, AVC, audio amplifier 1 6Q7
Phase inverter 1 6J5
Audio output 1 6K6
Tuning eye 1 6U5

Radio Power Supply Chassis (TRK-5/WRT-701 only)

Rectifier 1 5Y3