How To Replace Selenium Rectifiers • Choose The Right Diode & Dropping Resistor

Selenium rectifiers should be replaced. They can catch fire and emit toxic fumes. You’ll need a diode, but what kind? You’ll need a dropping resistor, but what value and wattage? In this video I show how to use your meter to find your circuit’s current. Use Ohm’s law to calculate dropping resistance. An easy calculation to determine resistor wattage. And simple steps to build a selenium rectifier replacement circuit.

IMPORTANT! Selenium rectifiers are marked differently than what we've come to expect with diodes. With modern silicon diodes, the cathode (striped end) is negative and the anode (non-striped end) is positive. Seleniums, however, have their cathodes marked as positive. Please consider this when replacing selenium rectifiers and consult the schematic for your device for proper diode orientation.

To learn more about the fascinating RCA Sound Cartridge Recorder shown in this video, please visit this link:    • The Huge Cassette!  

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