This circuit was found in a documentation from 1948. There are 5 valves with push-pull output. The source uses a transformer, and the indicated application is with turntables.
In the figure we show a widely used configuration for the CA3140. The power of this circuit can be...
The circuit shown was found in a Japanese publication from the 1960s. Transistors can be...
This circuit was obtained in a Popular Electronics of the 90s. The circuit can be assembled with...