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 turns on and off when a short pulse is applied by SW to the input of the first...
We found this circuit in a publication of 1991. The audio amplifier is an operational that admits...
The oscillator of the figure has its frequency determined by the crystal. The indicated value is...