This circuit is from a 1968 Electronic Design. The characteristics of the output transformer are not given and the transistors are of the time. The circuit provides a power of a few watts.
Found in a 70s RCA manual, this circuit uses transistors from the era. Equivalent types can be...
Found in American documentation from 1969, this circuit switches signals with a FET of the time....
Found in documentation from the 1980s, this circuit makes use of discrete components of the time....