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 includes the power supply from the power grid. We found it in Radio Electronics from...
We found this circuit in a 2003 publication. The indicated coil is for capturing the signals in an...
This circuit is from a 1967 publication. The configuration holds true for modern transistors having...