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 Pot Piss..........
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joro Offline






PostPosted: Fri Dec 12, 2008 8:24 am    Post subject: Pot Piss.......... Reply with quote

OK...I have a Hartke HA 3500 with really bad pre amp pots....so bad that the signal "Cracks" and gets lost...(until I rap on the amp itself to restore the signal....)

so....
either it's a bad connection or really dirty pots.....

I am planning on cracking it open today to troubleshoot and I wanted some advise on Pot Piss....
I bought the Radio Shack brand...tetrafluoroethane....with mineral oil....
is this stuff OK to use and if so...where exactly on the pots do I spray it?

any help would be greatly appreciated fellas...
Thanks...

Cool

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Lt. Bob Offline
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PostPosted: Fri Dec 12, 2008 8:31 am    Post subject: Reply with quote

first off ....... next time get DeOxit which you can also get at Radio Shack.

It's the best and not just the best but almost magical in it's ability to quiet dirty connections or pots. Actually, since you don't want to have to do this again ..... call that Radio shack .... make sure they have DeOxit (they should .... I get it from them) and if it's not too far away, return the Radio Shack brand and get the DeOxit.


Now ..... the Radio Shack brand is ok to use ..... won't hurt anything and it will help ....... just not nearly as well as DeOxit.

when you open the amp and look at the pots ..... there will be almost always be an opening in the can that covers the rear of the pot.
usually right above where the lugs that you solder wire to are located.
Spray the stuff into that hole so it gets inside the pot.
Turn the knob back and forth like a madman 20 or 30 times and repeat.
When you turn the knob back and forth what you are doing is wiping those contacts with the cleaner and the wiping cleans off those contacts. A second spray will wash any grime out and then the second time you turn the knobs you're kinda polishing the contacts and leaving a bit of protective stuff on there to help prevent the corrosion from byuilding back up too quickly.

What you're describing does sound like it could be dirty pots so hopefully this'll fix it.

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Last edited by Lt. Bob on Fri Dec 12, 2008 8:34 am; edited 1 time in total
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skod Offline
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PostPosted: Fri Dec 12, 2008 8:33 am    Post subject: Reply with quote

I'd use Caig DeOxit cleaner/rejuvenator for that, since you can't get Cramolin any more. The generic RatShack TF/mineral oil stuff may not do enough to preserve the carbon tracks, leading to crunchies again relatively soon.

As to where to put it: open up the rig and squirt it directly in on the carbon track from the back side (there's usually a gap in the case near the solder lugs that leads right to it). If the pot is a more modern, sealed unit, this can be hard- but then again those seldom go crunchy. You can't really get enough penetration from the front side (trying to get it in around the bushing that guides the shaft). Every pot is different...

I like the needle dispenser packaging with the 100% stuff- but the aerosol 5% stuff works just fine, and can make the job go quicker. http://store.caig.com/s.nl/sc.2/category.188/.f

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Lt. Bob Offline
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PostPosted: Fri Dec 12, 2008 8:37 am    Post subject: Reply with quote

as I mentioned above, he can get DeOxit at Rat Shack so he can get his money back on the Rat Shack cleaner.

I use the DeOxit D-5 cleaner and then occassionally since I live in a salt environment, I periodically just open amps and PA's and stuff and just spray them down with DeOxit Gold which really helps protect things.

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joro Offline






PostPosted: Fri Dec 12, 2008 8:38 am    Post subject: Reply with quote

wow....

you guys are great! Thumb Up Thumb Up
Thanks!! Cool

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Lt. Bob Offline
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PostPosted: Fri Dec 12, 2008 9:18 am    Post subject: Reply with quote

addendum:

If the pot IS a modern sealed unit ...... there are usually some small holes somewhere on the casings' rear cover ....... it doesn't take much ..... any hole you can find'll get enough stuff in there.
But I'm thinking that Hafler will have normal pots with a slot above the lugs.

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joro Offline






PostPosted: Sat Dec 27, 2008 6:28 pm    Post subject: Reply with quote

well there is a happy ending.....

I found the problem by doing what LT told me to do on another amp......

poke around with the cover off and the power on...

with a plastic knife of course.... Rolling Eyes

ended up being a dirty diode on the board......blew it out top and bottom with air and splashed some pot piss in there for good measure.....

good as new.... Cool

I also replaced the pre-amp tube while I was in there.....couldn't hurt....right?

The amp is married in a flight case with a Alesis 36/30 compressor/gate and a good Korg Strobe tuner......
I am playing it through a vintage Ampeg 2-15 stack or a vintage Kustom 2-15 stack....both configs are frickin' awesome....Cool great tone and growl....

Thanks again fellas.... Cool

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Lt. Bob Offline
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PostPosted: Sat Dec 27, 2008 10:45 pm    Post subject: Reply with quote

cool ..... and those old Kustom bass rigs were pretty good sounding. My first big rig was a Kustom with two of the three 15 cabs. I matched it against an Acoustic 360, which was the holy grail of bass amps for a while, and it slightly outperformed it.
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