Re: Noisy Pots

UZnal wrote:
Wake up, people: Is it safe to clean a potentiometer's contact with alcohol
or should I use compressed air? These fine dust particles emitted from the
cars start ruining my (cheap?) Denon amp which has those (cheap?) partly
encased pots.


As has been said, alcohol is fine. I usually squeeze some into the pot by soaking a swab and then spinning the end of the swab against an opening in the pot. Repeat two or three times. If you have the nerve to do it with the equipment live, you can easily work the pot back and forth until the scratch is gone. Just did this last night with an old Icom radio I'm fixing for a guy. Where you might run into problems down the road is the fact that the alcohol also removes lubricant from the pot. If I'm in a total rebuild/refurb mode, I've been known to disassemble the pot and re-lube it with silicon grease. I've used Radio Shack Teflon grease also, but I've misplaced my tube and, sadly, it's NLA from Radio Shack. Good stuff.... A small shot of a good contact cleaner/lube spray after the alcohol bath should suffice to replace lost lubricant.

I once had to completely disassemble all the pots in an old Heathkit panadapter (a radio gizmo, think "spectrum analyzer") because the shaft grease was so old and thick that the post were difficult or impossible to turn. Cleaning with alcohol and complete relube with the Teflon grease made them smooth as silk. Wish I could find the stuff....

-Jim


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