This 6W amplifier with 4 tubes was indicated in an American documentation from 1947 to operate with recorders. The circuit uses a source with a transformer.
Found in a 1967 EEE, this circuit oscillates at 20 MHz according to the values of the given...
In the figure we have an amplifier step configuration with a transistor suggested by a 1985...
This constant current circuit was found in the October 1993 Electronics Now magazine. The current can...