Selenium rectifiers are actually a stack of selenium diodes in series so they could handle higher voltages without melting, so the voltage drop across one is partially caused by that factor. One trick I have read about to replace a selenium is to stack several silicon diodes in series, each diode has a forward drop of .7 volts DC, although stringing together any more then three in series gets ridiculous so you may want to add a resistor in series anyhow.
Thank you for doing this video segment, it really helped me a lot. I have one final question. I noticed that when you checked the voltage, you had your meters negative lead to chassis ground. But I could not figure out where you had your meters positive lead hooked up. Did you hook it up to the electrolytics or where? Thank you for your help.
The only thing I've ever seen a copper oxide rectifier in is a speaker field coil from the late 1920s. I assume they are very inefficient compared to selenium and tube rectifiers.
Selenium rectifiers are actually a stack of selenium diodes in series so they could handle higher voltages without melting, so the voltage drop across one is partially caused by that factor. One trick I have read about to replace a selenium is to stack several silicon diodes in series, each diode has a forward drop of .7 volts DC, although stringing together any more then three in series gets ridiculous so you may want to add a resistor in series anyhow.
شكرا على احسن تعليق يشرح و يفصل السياينيوم
Thank you for doing this video segment, it really helped me a lot. I have one final question. I noticed that when you checked the voltage, you had your meters negative lead to chassis ground. But I could not figure out where you had your meters positive lead hooked up. Did you hook it up to the electrolytics or where? Thank you for your help.
Thank you!!!
I wonder why no one used copper oxide rectifiers in TVs or radios (at least that I know of)? Do they have too much voltage drop?
The only thing I've ever seen a copper oxide rectifier in is a speaker field coil from the late 1920s. I assume they are very inefficient compared to selenium and tube rectifiers.
Those things REEK when they fail.
150 v ac to 115 v ac