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Old 12th Nov 2017, 11:54 pm   #21
FERNSEH
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Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
Default Re: Vintage Television Technology.

The circuit diagram of the RCA KRK124 VHF tuner as fitted in the KCS136M chassis. Note that the 6CW4 Nuvistor valve was still in use in 1965.
Certain models employing this chassis featured a three function ultrasonic remote control system. The usual channel stepper plus volume up and volume down. The remote control is the mechanical "pinger" type. An interesting feature of this remote control system is the "Standby" and "Off" functions which are coupled up to the motorised volume control.

Introduced in 1960 the HMV model 1920 was a de-luxe 23" 405 line mono TV receiver. This up market model employed a single button remote control system which operated a motor driven turret tuner. A position was chosen on the tuner selector drum to provide the function "Standby". To prevent the receiver going into standby when searching for the required TV channel a thermistor was introduced into the relay switch circuit to give sufficient time for the Standby function to be implemented. The remote control handset was a mechanical device.

DFWB.
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