This amplifier was found in a tube equipment manual from 1947. The high-fidelity circuit has pentode tubes at the output and a source with transformer.
This circuit, from a 1968 Electronics World, is fed directly by the rectified voltage from the...
This 1986 documentation circuit provides 3, 4, 5, 6 V voltages under 350 mA for powering walkmans...
The purpose of this circuit is to restore the 0 V black level of an analog TV video signal at the...