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FDP Forum / Performer's Corner / dirty pots on gk Backline Bass amp

wborys
OldFartBassPlayerWalt

Robbinsville, NJ

what do you mean the bass is too loud?
Mar 8th, 2016 02:40 PM   Edit   Profile   Print Topic   Search Topic

brought out my 250 after a year of sitting in
a dry cellar.

True to form, volume/tone pots were incredibly noisy,
and the jack had to be cleaned out.

Is cleaning the pots something I can do myself
with reasonable chance of success?

Is it as simple as popping the cover, and squirting
radio tuner cleaner into a hole of each, and turning?

I'm not know for amazing tech skills, but I should
be able to handle this,

... Right?





Juice Nichols
Contributing Member
******

Panama City, FL

Same ol **** but my hair's longer
Mar 8th, 2016 03:27 PM   Edit   Profile   Print Topic   Search Topic

Did you try cycling the pots several times? I'm sure if you pulled the knobs off and sprayed some contact cleaner around the stems it wouldn't hurt it any.

I'm no expert, but I did sleep at a Quality Inn last night. ;)

Peegoo
Contributing Member
**********
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Eat. Sleep. Guitar.

Repeat
Mar 8th, 2016 03:39 PM   Edit   Profile   Print Topic   Search Topic

Yes...simple fix:

Rest your finger against the side of the knob and as you make a poking motion, the finger rotates the knob back and forth very fast. This scrubs the resistive track and gets rid of the crackles.

The pots aren't dirty...just a little oxidized from lack of use.



rockdoc11

USA

Bass is the place . . .
Mar 8th, 2016 09:34 PM   Edit   Profile   Print Topic   Search Topic

"Is it as simple as popping the cover, and squirting radio tuner cleaner into a hole of each, and turning?"

The procedure is pretty easy, and amazingly effective.

I'm not familiar with this model amp, but I assume it's a combo amp.

First make sure it's unplugged. Then . . . there are probably several obvious screws or bolts holding the amp head in place. Remove those, and carefully slide out the head.

Each of the "pots) the circular metal bodies behind each knob)should now be easily accessible. There is usually an opening in each of these pot bodies right where the wires are soldered to the pot.

Using the skinny red tube with a spray tuner cleaner/lubricant, spray a very short burst into the opening of each pot, then rotate each completely back and forth, maybe ten times each.

This will almost certainly resolve the issue, and be good for years.

Keep us posted!

Radio Shack cleaner and lubricant

tmc
Contributing Member
*

USA

Mar 9th, 2016 10:53 AM   Edit   Profile   Print Topic   Search Topic

I have a GK backline 600 head which I believe is similar in design to the 250. The pots do get scratchy pretty quickly when not used regularly. I remove the cover and use deoxit cleaner / lube on the pots. They are difficult to reach due to the way the circuit board is mounted. A long tube on the spray can and a good flashlight helps.

Tony Wright

Stillwater, OK

Built for comfort, not for speed.
Mar 10th, 2016 06:05 AM   Edit   Profile   Print Topic   Search Topic

I have done both "dry" as Peegoo suggested and "wet" with cleaner spray and had more or less equal results. If the amp was not exposed to a lot of airborne pollutants (smoke, lots of dust, etc) then you stand a very good chance that since it just sat for a year, it is likely just slightly oxidized as Peegoo suggests. Thus his "no intrusion into the amp head" approach of just "poking"...or fast exercising of the pots...it likely to be all you need.

I don't like spray if I can avoid it. My logic is that anything that you spray will leave some slightly residue which is likely to attract even more lint, dust, smoke residue....and thus require more frequent spray cleaning until you MUST take it to a tech to dismantle and either clean with a q-tip or replace pots....

My 2 cents. Try the easy way first. It is easy, usually works at least for a while, and it costs nothing.

Peegoo
Contributing Member
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Eat. Sleep. Guitar.

Repeat
Mar 10th, 2016 07:47 AM   Edit   Profile   Print Topic   Search Topic

I agree, Tony.

Any cleaner that leaves a lubricant behind is something that over time creates the need for more frequent cleanings.

The lubricant remains sticky inside the pot and that causes dust and grit to stick in there. It cannot be blown out. It needs to be blasted out with a spray solvent.

Anytime I clean a pot with a spray, it's something that leaves no residue.

CRC and Caig make good stuff.




iammr2

Lower Slobovia

Pass me the onions..Yeah, the green ones
Mar 11th, 2016 10:00 PM   Edit   Profile   Print Topic   Search Topic

I've had better luck with DeoxIT. Comes in different applications. I think the D-series is what you'll want.

And please, wear safety glasses just in case it sprays back into your face. Had that happen before. Not pleasant.

No Association to this product.

(This message was last edited by iammr2 at 12:01 AM, Mar 12th, 2016)

wborys
OldFartBassPlayerWalt

Robbinsville, NJ

what do you mean the bass is too loud?
Mar 13th, 2016 09:34 AM   Edit   Profile   Print Topic   Search Topic

hey guys, thanks for the sharing!
fINAL VERDICT: the 'dry' cleaning
worked in this case, no need to open
up, or worry about lubricants.

This is the third GK amp I have that
had this problem- is there something
special about their components?
Don't seem to have that level of
problem with fender, or ashdown

or is I just use them more often?

Peegoo
Contributing Member
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Eat. Sleep. Guitar.

Repeat
Mar 13th, 2016 09:55 AM   Edit   Profile   Print Topic   Search Topic

THAT ^^^ is the thing!

*Lack of use* is the primary cause of scratchy/noisy pots--whether on an amp, bass, or guitar.

The pots are not necessarily dirty...just a bit oxidized is all.

Roll them through their full travel a few times and that solves the problem in the vast majority of noisy-pot cases.

Steve Dallman
Contributing Member
*********

Merrill, Wisconsin

Age is just a number...mine is big
Mar 15th, 2016 11:14 AM   Edit   Profile   Print Topic   Search Topic

As a tech, I have used a good amount of Deoxit and Deoxit's Faderlube (F5). I've cleaned many a pot.

I started out loving Deoxit, but over time, started seeing pots getting noisy after not too long. Lots of amps returned to me after I cleaned the pots.

I had good luck with the cheaper of the two Radio Shack Color TV Tuner Cleaner products...until they switched to a non-freon product...alcohol and mineral oil basically. (The more expensive of the Tuner Cleaner was not pot friendly.)

I tried Deoxit F5. It worked well, and I have not had any trouble with further noise, or dust/dirt buildup after use.

I've used a lot of it. With pots I couldn't get replacments for, or really difficult pots, I will take the back off, manually clean the trace, and get all the dust and debris out of the pot, then use 100% F5 carefully on the trace. This also gives me a chance to carefully inspect the wiper and track.

Some plastic shaft pots on old PV amps are hard to replace, and so taking them apart began.

Steve Dallman
Contributing Member
*********

Merrill, Wisconsin

Age is just a number...mine is big
Mar 15th, 2016 11:16 AM   Edit   Profile   Print Topic   Search Topic

...When using even the F5 spray, I will use compressed air to get the debris and dust out of the pot before using the lube. On a few really dirty pots, I could just picture making a slurry of the dust and lube...

FDP Forum / Performer's Corner / dirty pots on gk Backline Bass amp




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