1940s commercial receiver (T1618E)

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

Up to 1 Hour timer (CB21424E)
This circuit was found in a 1960s General Electric unijunction transistor manual. The circuit can...
2-Transistor Regulator (CB20298E)
In the figure we have the configuration of a variable voltage regulator with two transistors and a...
90 dB CMRR Amplifier (CB6637E)
This circuit was found in Raytheon's 1967 documentation. The circuit uses an operating of the era,...