Thermostatic control with mercury sensor (CB21388E)

This former temperature sensor with a mercury sensor was found in a General Electric documentation from 1967. The SCR must match the load.

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Low Consumption Clinical Thermometer (CB14000E)
We found this circuit in the 1982 Selezione Radio magazine in Italy. The circuit uses an...
3 W Amplifier (CB6201E)
This circuit was obtained from Dutch documentation from 1967. It uses transistors of the time...
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This circuit was found in a 1966 General Electric book. The triac and the day are from that time...