This 4-tube amplifier with 6W of output was found in an American manual from 1947. The sound quality is excellent.
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...