Kinescope Rejuvenator (T464E)

This utility circuit for old TV restorers was found in a Popular Electronics from November 1968.

Capacitive Antenna (CB13646E)
This circuit was obtained in a manual for radio amateurs from 1975. It is a circuit that allows the...
4-Transistor MW Radio (CB18833E)
This is the circuit of a commercial radio sold in Japan in the 1960s. The IF is 455 kHz, and the...
Common Mode Rejection (CB19645E)
In this circuit found in a Texas Instruments 2016 documentation we have an adjustment for the...