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 circuit appears several times in this section and on this site, obtained from different...
This circuit was found in a General Electric documentation from 1970. Equivalent transistors can be...
The circuit shown consists of a NO and NC sensor system for alarms. The output must be connected to a...