Found in an American publication of 1968, this circuit makes use of a pilot light of the time. It can be replaced with LED with appropriate series resistor. Transistors may be modern equivalents.
This interesting high-quality amplifier configuration was featured on the cover of the June 1994...
This circuit was obtained in a documentation from the 80's. The components used are of the time,...
This circuit can be added to any audio amplifier design, consisting of a good tone control with an...