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Old 24th October 2011, 03:46 AM   #1
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Default Old DIYtube ST-35 electrolytics - swap?

I got a Rev.B board last year that had been populated in 2003 I believe. Never been powered up, and I've had it sitting for nearly a year as I can't decide if I want to build it or go to a SS power amp with a tube pre. Anyway, what's your opinion of powering this board up as far as the electrolytics are concerned? Swap them out at this point? FWIW, I don't have a variac so that's not an option.
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Old 24th October 2011, 04:11 AM   #2
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Light bulb trick?
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Eli D.
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Old 24th October 2011, 04:44 AM   #3
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Quote:
Originally Posted by Eli Duttman View Post
Light bulb trick?
To be quite honest I haven't even bothered to buy the iron for the board yet

I was just weighing my options if I need to replace 8 big caps or just forget it.
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Old 24th October 2011, 07:30 AM   #4
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9 or 10 years since manufacture is certainly marginal for good sound.

If they are decent quality, you can still use them, with the Panasonic method of restoration:

Use a high-power series resistor to limit the leakage current (start with 47K 14W, say). Apply 200 to 400Vdc for a minute, and watch the voltage across the resistor drop. If the leakage current you measure falls to the rated value, they should be safe.

Panasonic, Nichicon are good enough quality to give this a try. Caps with odd names, and Illinois (IC) TTA series etc are often poor, and not worth even a small amount of trouble.
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