This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
This circuit was found in an American 80's documentation. However, it can be implemented with...
One touch on S1 and the circuit turns on. With a tap on S2 it turns off. This is the purpose of...
This 15 W power stage was found in Radio Electronics magazine from August 1959. The transistors are the...