This 2-tube amplifier was found in a Japanese publication of 1964. The circuit has excellent sound quality. The power supply is not given and must provide a voltage of 300 V.
This interface was found in a Modern Electronics magazine from 1990. Although the circuit is...
This circuit, found in a 1980 publication, limits the amplitude of the output signal to a value...
The circuit is from old documentation from the 70s, but the components are still common, as the...