This small tube amplifier appeared in Radio Electronics magazine in February 1958. The circuit is powered by the mains with a power transformer and output with different impedances.
This circuit was found in a 1964 documentation. It shows how to achieve automatic gain control for...
We found this circuit in the June 1991 issue of Radio Electronics magazine. The circuit can be...
This circuit drives an old tape recorder when an audio signal is received. The circuit is...