DC leakage making pots scratchy?

[JazzGuitarGimp]

What about this type? I got this from Weber after a long-winded search for it after seeing it in gut shots of a /13 amp. I've measured it with my fluke a few times, both between eyelets as well as pushing the probes onto the board itself, and I am not seeing any measurable resistance. Of course that doesn't mean it won't suck in moisture over the years. Anyone have experience with it?

[Randall]

Just to follow up. after two days of rain with the board sitting untouched I am now measuring dc voltages where there were none or very close to none after heating the eyelets. This is enough proof for me that the fiber material in this particular board is not suitable for building an amp on. I have informed the supplier, and we shall see what, if anything comes of it.

[Leo_Gnardo]

Just to follow up. after two days of rain with the board sitting untouched I am now measuring dc voltages where there were none or very close to none after heating the eyelets. This is enough proof for me that the fiber material in this particular board is not suitable for building an amp on. I have informed the supplier, and we shall see what, if anything comes of it.

That just about says all we need to know. And thanks to Gingertube for a good explanation & suggestion but with this black fiber board, I'm afraid coating it won't really help. Dampness will seep in over time, through small defects in the coating, and the coating would keep it in the board. I've seen some attempt at this using what looks like ordinary white wax in some old Fenders. They never imagined their amps would still be in use 40, 50, 60+ years after they were made.

I can imagine what answer you'll get:

Dear Mr. Randall, we don't have any problem with it at all.
Fiberboard Industries Inc.
Death Valley CA

[Randall]

Dear Mr. Randall, we don't have any problem with it at all.
Fiberboard Industries Inc.
Death Valley CA

Funny you should say that, because I did mention that perhaps it would not be a problem if I lived in a desert, but since I live next to the Atlantic ocean, it will not do.

[Leo_Gnardo]

What about this type? I got this from Weber after a long-winded search for it after seeing it in gut shots of a /13 amp. I've measured it with my fluke a few times, both between eyelets as well as pushing the probes onto the board itself, and I am not seeing any measurable resistance. Of course that doesn't mean it won't suck in moisture over the years. Anyone have experience with it?

If you can soak a piece in water for a day or 2 then check R, that would tell.