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 tuned circuit was found in a 1966 Electronic Circuit Handbook. The transistor can be any...
This circuit was found in Ferranti's 1974 transistor manual. Transistors are general purpose types...
This circuit was found in a Popular Electronics from 1991. The transistor could be the BC548. The...