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In Reply to: RE: Selenium Rectifier Lowdown posted by mark.korda@myfairpoint.net on January 20, 2017 at 07:43:49
If it works, it's time to go. Besides the high forward voltage drop they aren't very good with reverse voltage. When they fail a toxic gas is emitted that smells really, really bad. Unless you want to maintain your gear as vintage there really is no good reason to keep them. You can do a search on them and read the same story over and over.
Follow Ups:
And, Half-Wave Rectified to boot ? Yes, I am talking genuine, stateside made stereo preamps. The kind anyone of us would be proud to own. I am thinking of two units which begin with sequential letters...
Wasn't that a good hint ? Yes, I will spare you the brain power...
Lafayette KT600/KT600A and Marantz Seven(7C) originally come with Half-Wave Selenium Rectified Power Supplies. That means only one, small stack disc for the High Voltage supply.
If you replaced these with silicon diodes and adjust voltages with a resistor, you might have preferred the sound with the selenium rectifier.
I am not condoning either method. I am simply posting this here, so all can consider the facts. Surely, conversion to silicon or modern bridge diodes might be beneficial electronically. Soundwise, what if you actually prefer the half-wave selenium with more capacitance added to the power supply cap banks ?
If you were restoring a Marantz 7C, you might prefer to "bypass" the selenium, but leave the selenium in place for that vintage look the buying collector wants to see...You all have seen the prices of the 7C rising rather sharply through the years, right ? There must be something about the sound of that unit which keeps demand going, right ? BTW, the Lafayette KT-600 is no slouch in the sound department either....
Hi Interstage,
I'm going with your idea on the matter. I'm not rejecting the other way to go but by going by my manual it's easier for me to finally get the project done.
You guys have given me tips that really can't be found in books. Any output from you all is greatly appreciated and noted....thanks Mark Korda.
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