This circuit is from a Radio Electronics from October 1963. The transistor is a power transistor of the time, and two transformers are used. The input has 10k impedance and is powered by 12 V.
This circuit is from a 2001 publication. The balun transformers are of the commercial type for TV...
This circuit is from an old publication from the 1950s. The circuit uses germanium transistors but can be...
This amplifier, from the 1990 Philips Databook, is suitable for automotive applications. The...