This amplifier with the EL84 tube is a European commercial type from Corpim mounted on a printed circuit board. The diagram appeared in a September 1958 Radio Electronics magazine.
This circuit uses a metal enclosed transistor as a temperature sensor. The circuit is from an old...
This 13.8 V power supply with 10 A output is intended to supply power to automotive power...
This circuit with PUT is from a 1967 General Electric manual. The relay must have voltage...