This 6-tube two-channel amplifier was found in an American documentation from 1947. The circuit is two-channel with a separation of bass and treble.
This fixed current source uses a Norton LM3900 amplifier. The maximum current depends on the...
This circuit was found in a 1973 publication. The SCR may be the TIC106 and must use a heat sink,...
This circuit was published in a 90s Radio Electronics. The circuit uses the well-known LM386 that...