This circuit is from an Electronics World of 1968. The transistors are of the time and the power is supplied with a voltage of 40 V. The circuit is high fidelity.
This Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW...
Found in Radio Electronics from the 90s, this circuit is based on the 555 directly feeding a small...
Found in 80's Electronic Engineering, this circuit can tune the frequency to be rejected. The power...