Simple 1-tube receiver (T960E)

This 1V heater tube circuit was found on a Radio Craft from 1945. The circuit is for medium wave and can be used as a tuner.

Temperature Sensor II (CB5051E)
The previous circuit (CB5050E) triggers when the temperature exceeds the limit set on the...
Analog voltage sensor (CB21511E)
Found in a 1960s Electronic Design, this circuit provides a signal from the sensing of an analog...
Millivoltmeter CA3018 (CB24093E)
We found this sensitive high input impedance voltage amplifier in the November 1970 Radio...