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In Reply to: RE: some questions on my Scott299A rebuild... posted by gkargreen on December 04, 2014 at 13:27:38
did a breakdown and cleaned out both the balance and vol pots, the balance pot had some goo inside it, the vol pot was fairly clean, but I cleaned the tracks with IPA and then with D5 applied topically to the tracks. Running the vol pot on the scopemeter it tracks pretty close, about 3-4k difference between the two sections. After the epoxy dries (had epoxied the new F & T caps onto the old wafers for the cans, the one on the end has popped of twice when I knocked against it from the side...) I will run it on the scope and track the signal voltage to see if it is better now...
I am planning on replacing the slide switches on my 299, I found what I hope will work that has gold contacts and is sealed. This 299 was really clean until I opened the control cover, then I saw what looked like white/yellow goo all over each of the two bandswitches, had to completely take them apart and clean them, only way I could get the goo off, looks like some of that same goo may have gotten into the balance pot...
Follow Ups:
How do you take apart those pots?
Dave
carefully lift the tabs after removing the little shoulder ring around the shaft, the pot then is open for cleaning. Removing the shaft ring allows the rotary contact to be removed so that a thorough cleaning can be had, wasn't able to do that for the dual pot as the rotary contact on the upper pot was stuck on the shaft, other dual pots I have done has the upper rotary contact easily removable. Yes, this is a little extreme but will result in the best performance you can get from cleaning a pot, although I would like to replace them with a top quality pot. Unfortunately, finding pots with taps, like quality audio pots from Alps, etc. can be challenging and searching that will be for another day...
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