No information is given on the transformer in this circuit that we found in an American 1967 documentation. The power transistors are of the time and mounted on a plug-in module.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...