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I have one data point. My McIntosh C-28 had some pretty serious contact issues in the function selector switch. Tried several times cleaning it with R/S contact cleaner with no real improvement. Bought a can of DeOxit on a lark when PartsExpress had it on sale. Tried the DeOxit on the balky function switch on the C-28, and it worked!
I have been sold on DeOxit ever since. For whatever reason, it's an outstanding product.
You can see that nasty switch in the top left of the attached photo...
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all the best,
mrh
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