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.
Found in Popular Electronics from the 90's, this circuit uses common components and can be easily...
This circuit was found in a 1973 publication. The SCR may be the TIC106 and must use a heat sink,...
This circuit was obtained from my Mechatronics Sourcebook, published in the United States. In it...