This 12.5 W quasi-complementary amplifier was found in a 1969 General Electric publication. Note the high supply voltage. Transistors are common types at the time.
I found this circuit on a December 1976 Radio Elettronica. The Italian magazine no longer exists, but...
We find this circuit in a 1978 documentation. The circuit uses two inverters of a 4049 integrated...
This circuit is from 1995 documentation, but can be easily assembled today, as the components used are...