This is a low-gain amplifier to operate as a booster. We found it in an American documentation from 1947. The circuit uses a coupling transformer at the input.
The previous circuit (CB5050E) triggers when the temperature exceeds the limit set on the...
Found in a 1960s Electronic Design, this circuit provides a signal from the sensing of an analog...
We found this sensitive high input impedance voltage amplifier in the November 1970 Radio...