Quote:
Originally Posted by Kamakiri
Set is now powered up and functioning, so now I can check and replace the seleniums.
To do so as I understand it, black lead on the AC side, red lead on the positive side (basically one on each side of the rectifier), watch for fluctuations on power up, set meter for DC voltage. Sound correct?
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If you are measuring voltage drop across the selenium rectifier, yes. With a DMM, polarity really doesn't matter. What is your B+ measuring right now, with the selenium? Note it now, so you can be sure to match it with whatever dropping resistor you choose.
The last selenium I replaced (in a drug-store tube checker), had 2.9 volts across it. I replaced it with 5 series connected 1N4007 diodes, and it is still plugging along. Just to show that not all selenium replacements require a resistor. My selenium was a Sarkes-Tarzian, rated at 400mA, so the 1 Amp diodes were overkill, but matched the B+ within 2 volts, good enough for me.
Cheers,