Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load. The response ranges from 20 to 20 000 Hz. No information is given about the transformer used.
This circuit was found in a 1973 publication. The SCR may be the TIC106 and must use a heat sink,...
This circuit is from the time when slide projects were used. We find it in a 90's Wels’ Think...
This circuit was found in a Radio Electronics Constructor, English magazine of April 1976; The...