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.
We found this circuit in an old documentation, but it is still current, being able to feed sets of...
This circuit was obtained in a 1977 magazine, but it can still be easily assembled, as the...
This circuit was found in a 90s American documentation. The circuit uses an LED that can be of a...