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 circuit was found in an English magazine from 1981. We can still assemble it using BC548...
June 2017 - The new touch switches C & K KXT series can now be obtained from Mouser Electronics. These...
This oscillator, which can be used as a signal injector, was found in a Popular Electronics from the 90s....