Multi Tube Amplifier (T446E)

Obtained in MIT documentation this circuit uses several tubes to obtain a large gain in the amplification of small signals.

Temperature Regulator For Brooder (CB17052E)
This interesting project was found in a 1995 documentation. It controls the temperature of the...
Low impedance preamp 1 (CB21894E)
Found in a Raytheon transistor manual from the 1950s, this circuit uses one of the first...
Test Transistors (CB15092E)
The circuit shown in the figure is a simple test of NPN and PNP transistors. The circuit detects the...