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FDP Forum / Amp Mods, Repairs, and Projects / 66 Super Reverb noisy pots, won't clean up

Mars Hall

USA NW Indiana

May 11th, 2019 05:48 AM   Edit   Profile  

The volume, Treble and Bass pots have the scratchy noise while being rotated. I've used Deoxit Gold G5 on several occasions with out relief, noiose returns almost immediately. Outside of changing pots, are there any other recommended spray alternatives?


Too Near Atlanta GA

Amp Tech Emeritus
May 11th, 2019 07:35 AM   Edit   Profile  

You might have leaking coupling caps that put DC on the pots, or you might simply have damaged carbon substrate on the pots. Be sure to apply the deoxit into the pot properly and work the control back and forth a number of times....or you might have to replace the pots.


Mars Hall

USA NW Indiana

May 11th, 2019 07:44 AM   Edit   Profile  

By coupling caps do you mean the 25v/25uf electrlytics? Those have been replaced.

Contributing Member


May 11th, 2019 07:51 AM   Edit   Profile  

Those are cathode bypass caps. In the schematic chase the lines back from the pots. You'll find the coupling caps. They're in the pot signal flow. I'm not looking at a schematic, now, but that will get you to those.

If those are good, it probably needs pots.

Mars Hall

USA NW Indiana

May 11th, 2019 08:27 AM   Edit   Profile  

From viewing a layout and schematic, it seems the middle and bass pots share a .022 cap? If this is the case, would both Bass and middle pots exhibit noise?



May 11th, 2019 12:00 PM   Edit   Profile  

No, I think the scratchiness would be mostly, maybe even totally, on the middle control.

FDP Forum / Amp Mods, Repairs, and Projects / 66 Super Reverb noisy pots, won't clean up

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