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 is from a Popular Electronics of December 1993. In it we have the way to externally connect...
With this power supply it is possible to use automotive devices with currents up to about 8A on the...
This circuit was found in a 80’s American documentation. The adjustment trimpot is from 47k to...