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Old 25th January 2013, 11:21 PM   #21
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Default WD-40 will [?] soften the binder

Quote:
Originally Posted by turk 182 View Post
KMossman
Yikes!
in my experience WD-40 will soften the binder that holds the carbon in the potentiometer track in place allowing them to wear prematurely!
the only time i would suggest using wd on a pot is to try and free up a shaft that's frozen in place or extremely stiff never on the carbon track.

perhaps I was clear enough

AFTER using contact cleaner, if the pot is still a problem, THEN try WD-40

I am NOT suggesting spraying WD-40 willy-nilly.

IF at that point, it did soften the binder (destroy the pot), who cares...it was already a lost cause.


and in 10 years I had yet to destroy a pot using WD-40, however I have noticed that I have to 'move' the pot a little slowly else the noise comes back - though it disappears when I go back to 'moving' it slowly.

It is a last ditch effort. It has worked several times for me...............

Last edited by KMossman; 25th January 2013 at 11:28 PM.
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Old 25th January 2013, 11:25 PM   #22
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Quote:
Originally Posted by turk 182 View Post
genco
have you had a chance to measure if there's any DC across the control?
i still think you may have capacitor troubles.
That can be a cause, IF the DC is significant.

I have had to 'correct' some amps that had problem (no blocking cap, and a poor design were the causes).
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Old 26th January 2013, 02:00 PM   #23
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any presence of DC even as small as1/2 a volt on a volume control should be investigated as it's not supposed to be there.
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Old 26th January 2013, 10:19 PM   #24
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I agree - usually there should be no DC on a volume control, but isn't the current the major concern?

ie

0.5V at 100mA is a disaster

0.5V at 100picoAmps is curious
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Old 17th February 2013, 05:17 AM   #25
bfp is offline bfp  Romania
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Hi gencogenco,
I am trying as well to solve a potentiometer issue like you are trying here. Did you solved it ? In the same time there might be a little off topic but I would like to know your symptom details since there are not stated in the begining post.
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