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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Using a Variac posted by Phil D on July 21, 2007 at 18:00:00:
Phil- You may want to do a search over at tube DIY as I remember someone (one of the gurus) posted in great detail a procedure for using a variac. But for the most part, if the component uses a tube rectifier, it won't even start passing DC voltage until you've reached 40 volts or so on the variac. I just thought I'd mention this so that you don't waste a few hours feeding it 10. 20 , and 30 volts. One thing that I usually do is replace the tubes( if I have them) in the unit in question with known "good" tubes, but not premium versions, just in case. It is also a good idea to monitor voltages in critical positions (power supply)in the circuit while raising the voltage. Keep an eye (or thermometer) on the temperature of the can caps and other electrolytics as they will get very hot if they are not "reforming" correctly. Be careful though as some metal can caps have the voltage present on the OUTSIDE of the can, usually they are covered with a cardboard or plastic sleeve , but sometimes these have fallen off or been removed. Most of all, just be very careful when probing around in unfamiliar territory, you may be "shocked" at what you find. Good luck and have fun, regards, wpod
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Follow Ups
- RE: Using a Variac - wpod 07/22/0705:17:58 07/22/07 (0)
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