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Rectifier Vacuum Audio Tubes Valves @ BangyBangTubes

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The reverse operation (converting DC to AC) is performed by an inverter.

https://en.wikipedia.org/wiki/Rectifier

Example of rectifier tubes:

1) 5Y3,
2) 5AU4
3) 5DJ4
4) 5V3

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