4W Amplifier (T1516E)

With only 3 tubes, two of which are double, this circuit provides an output power of 4 W. The circuit was found in a May 1956 Popular Electronics.

Smoke Detector (CB5965E)
This circuit is from an American 80's documentation. The integrated circuit is from the time and...
HEP590 Video Amplifier (CB4184E)
The integrated circuit used in this 80's application is very hard to find today. The circuit is of an...
Relay Oscillator (CB25723E)
This low-frequency relay oscillator was obtained from an article in Electronics Now magazine in...