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!!!

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.

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?

Those things REEK when they fail.

150 v ac to 115 v ac