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Classic gear from yesteryear; vintage audio standing the test of time.

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RE: Scott 130 preamp question

Posted by Thermionic27609 on March 15, 2017 at 15:17:07:
I hadn't realized isopropyl alcohol would remove silver sulfides, but I'll give it a try!
The Noxon 7 I mentioned has oxalic acid in it that removes stubborn oxidation on brass and tin-plated connectors, but it's not for use on silver. It can work wonders on miniature 9 and 7 pin tube pins if used delicately.
With the Pyramid Imps, I realize I'm taking a risk, but I work on a lot of older gear. 400V caps like this run at 110-120V DC are less likely to fail that when run >300V, but it varies a lot by brand and type. CDE had a line called "Tiny Chief," and they are pretty much always bad.