Paraphase amplifier (T389E)

This 6C5 tube circuit was found in a modern tube design manual. The circuit applies to other equivalent triodes.

Fluorescent Lamps Night Control (CB4668E)
This circuit triggers a relay when it gets dark, thus enabling the lighting of fluorescent lamps, which...
Audio Visual Output Indicator (CB25193E)
This circuit was obtained from a Radio Electronics issue from January 1989. The indicator is a...
Temperature Sensor II (CB5051E)
The previous circuit (CB5050E) triggers when the temperature exceeds the limit set on the...