This amplifier with fixed AC bias was found in a 1947 documentation. The circuit uses two transformers in the power supply and two full-wave rectifier tubes.
This circuit should be placed between the signal source and the input of a recorder or amplifier....
This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a...
This traditional circuit of old documentation uses a 0-1 mA milliammeter and has several scales....