3-channel preamp (T484E)

This 4-tube circuit was found in an American publication from 1947. It is intended for audio distribution lines using a transformer source.

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Nuclear Particle Detector (CB5927E)
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Thermometer Using a Diode (CB382E)
The sensor in this circuit is a BA315 diode. Other diodes can be experimented, but this is one...
Active Filter (CB5109E)
This active crossover filter was obtained from the component manual used. Below is the performance...