1940s commercial receiver (T1614E)

This superheterodyne circuit was found in a Radio Electronics from 1949. It used 5 tubes being one a double rectifier. The output was on speaker.

Signal Drop Detector (CB6117E)
This circuit was found in an 80's General Electric documentation. The circuit uses uncommon...
Cascading the 4029 (CB179)
Figure bellow shows how many 40293 can be cascaded. The input CI of the first circuit is grounded. The...
Phase Shift Oscillator (CB4252E)
This is a typical RF oscillator configuration found in a 1980s documentation. The frequency...