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 traditional direct amplification MW radio configuration was obtained in an American...
This circuit was found in an American book on transistors from the 60's. The transistors are...
This circuit, suggested by Texas Instruments, allows the control of high-power loads powered by...