This 7-tube circuit was obtained from an American publication in 1947. The circuit has a push-pull output with a source using a transformer.
This circuit was found in a Popular Electronics from the 90s. The circuit uses a general purpose...
This 2000 circuit can work with one of the many infrared remote-control transmitters described in this...
We found this amplifier for automotive use in the Philips Databook of 1990. The circuit has a...