1940s commercial receiver (T1618E)

This receiver was found in a Radio Electronics from 1949. It is a superheterodyne of the time using 6 tubes.

Ion Meter (CB25286E)
This circuit is part of an article published in the March 1990 issue of Radio Electronics...
Three Transistor High Gain Amplifier (CB982E)
This circuit, found in a publication of the year 1968, uses a MOSFET at the input to increase...
Code Practice Oscillator (CB1429E )
Found in a 1975 radio amateur publication, this simple oscillator is for code practice. The PNP...