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Old 21st April 2002, 01:01 AM   #1
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Default How to repair a Dirty pot on Amp (hissing)???

Hi everyone, can anyone help me out on how to clean a pot on my amp, it produces an unbearable hissing in the right channel, which varies in intensity as the volume dial is turned.

Thanks a lot,
Matt
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Old 21st April 2002, 01:28 AM   #2
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Default Lisandro

Just replace the pot... you could get an electronic contact cleaner for the same price, but trust me, is only a temporary fix.
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Old 21st April 2002, 02:01 AM   #3
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i'll second that.... contact cleaner may help the problem but the only way to fix the problem is to replace the pot.
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Old 21st April 2002, 12:17 PM   #4
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OK then, seems like I'll have to some hunting for an old part!!!

Or, its gives me an excuse to buy a new amp

Matt
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Old 21st April 2002, 12:49 PM   #5
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no need to go hunting for an exact replacement unless it is a motorised pot and then your choice will be somewhat more limited. All you need to do is make sure the new pot has the same number of gangs, the same resistance, the same transfer function (log or linear) and the same shaft diameter.
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Old 26th April 2002, 12:57 PM   #6
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Default Re: How to repair a Dirty pot on Amp (hissing)???

Quote:
Originally posted by mattpman
Hi everyone, can anyone help me out on how to clean a pot on my amp, it produces an unbearable hissing in the right channel, which varies in intensity as the volume dial is turned.

Thanks a lot,
Matt
Hi Matt,

I have used with best results and since many years
on different pots, oil in a spray can (it`s no joke!). Turn off the amp, Spray a very small burst
into the slits of the pot(were the pins goes in) and move several times from left to right.If the pot is complete capsuled check whether it is possible to disassemle carefully, then spray a small amount directly on the carbon surface and slider contact and wipe it of with a tissue.
you can be shure there is no influence of the sound quality of the amp!!
I use KONTACT 88 from Kontact Chemie or Ballistol
(oil for weapons)I think BALLISTOL is avialaible in U.K.
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Old 26th April 2002, 01:21 PM   #7
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Agree - oil usually works. If the pot can be open, then pack it with some grease - it will quiet the most obnoxious pots. While some people might get nervous about such fix, that might save a lot of labor and usually works great for quite some time.
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Old 26th April 2002, 07:38 PM   #8
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Thanks for both your input, would WD40 work, or would it corrode the contacts? Thanks, Matt
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Old 26th April 2002, 08:15 PM   #9
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Unhappy Gone to Pot

I have never heard such bad advice. Is the amp hissing only when you adjust the pot? If it is hissing after you stop turning the pot the amp is probably oscillating and you have a completly different problem than the pot. If you put WD 40 or grease in the pot you will be buying a new one.
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Old 26th April 2002, 08:26 PM   #10
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Default Slight oops

I have to take some blame for that advice. As I reread carefully the original post it is clear indeed that it might not be the pot. I thought it was talking about scratchy pot. Oops and should read more carefully.

However, packing grease in a pot is a good solution for a part that is going bad. I have done so many times, and so far have not had to replace any of them.

Again - this in case of a scratchy pot.

I am somewhat hesitant to recommend the WD-40. I have used it once, and the immediate result was good, but after sitting for some time it developped sticky feel. Usually that stuff lieave sticky residue. But some sort of good grease - never a problem.
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