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.
Toshiba MOSV MOSFETs These and others from the same line of Toshiba power MOSFETs are available from...
This circuit is from old American documentation, but the transistor used is still very common...
This circuit can control the speed of Motors up to 2 A and voltages in the range between 3 and 12...