Alternative Replacement POT

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AtypicalOne
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Alternative Replacement POT

Post by AtypicalOne »

Good Evening - I have a Fender Super 60 which I purchased from a private sale. It works and sounds great except the bass adjustment knob spins without restriction in both directions and I note no change in sound when doing so. I can only presume the entire Pot requires replacement. With this in mind, I contacted both a Amp parts store as well as Fender directly. Here is a summary response from both,

"The pot you are looking for is Fender part number 002 8576 000 and unfortunately Fender has discontinued carrying that part many years ago and they are very tough to find. It's a 250K with a special 20% 10% log taper."

I'm still kinda a beginner at guitar, let alone anything to do with the amp beyond simple adjustments. Can someone assist me in selecting the correct replacement? Then I'll try to find someone local to help me perform the surgery, so to speak. ;)


Thank you and Good Night ~ Keith
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EugeneTheJeep
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Re: Alternative Replacement POT

Post by EugeneTheJeep »

Did you make sure the set screw on the knob is tight?

Some pots have push on knobs, others use a set screw.

Also, you can just get an audio (log) taper 250k pot, without the the special taper and it will work just fine.
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AtypicalOne
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Re: Alternative Replacement POT

Post by AtypicalOne »

Thank you for the timely reply.

To answer your question and respond to your recommendation;

EugeneTheJeep wrote:Did you make sure the set screw on the knob is tight?
It is a push-on style knob. And, when I remove the knob, the remaining pin spins freely as previously described.

EugeneTheJeep wrote:Also, you can just get an audio (log) taper 250k pot, without the the special taper and it will work just fine.
OK, Great! - Sounds like the least resistant path at this point. However, as I denoted, I'm uncertain what this means. Remember, I'm still sorta new at this. Where would I go to find an "audio (log) taper 250k pot"


Thanks Again - Keith
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Gunslinger
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Re: Alternative Replacement POT

Post by Gunslinger »

Any place that sells guitar/amp parts pretty much.
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Re: Alternative Replacement POT

Post by clipless bumper »

yeah - you just want an audio taper, not a linear taper pot.
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AtypicalOne
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Re: Alternative Replacement POT

Post by AtypicalOne »

OK - Thanks again for the help. So, I can walk into a local guitar shop and say,

Hi, I'm looking for an "Audio (log) taper 250k pot"

And that should get me what I need?
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Re: Alternative Replacement POT

Post by clipless bumper »

Yup - as long as they sell parts.

You could order it online from All-Parts or many other places also.

There are full-size pots (better) and mini pots (cheaper) too.
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AtypicalOne
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Re: Alternative Replacement POT

Post by AtypicalOne »

mamberg wrote: You could order it online from All-Parts or many other places also.

There are full-size pots (better) and mini pots (cheaper) too.


Great - I think ordering on-line my be my better option. When I go into local guitar shops I think they recognize I'm sorta a beginner still and try to treat me like a girl in a fancy dress at an auto garage. LOL ;)

With regard to full-size versus mini pot, is there a significant affect on performance?

Thanks again - Keith
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Re: Alternative Replacement POT

Post by clipless bumper »

Bigger is better in this case - smaller is cheaper.
Although you may want to match what is in there - if it is board (PCB) mounted pot - you will need that specific type and size to be have an easy switch.

If it is connected with flying leads (wires) - then you probably have a bit more leeway.

There are also 'feel' differences between brands of pots - Bourns are one of the best - nice smooth feel when turning them.
CTS is a good all-around easily found brand.
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AtypicalOne
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Re: Alternative Replacement POT

Post by AtypicalOne »

Well now I'm confused. I'm guessing I should take the panel off to see specifically what I have? I thought the specs I was already provided would suffice?
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Re: Alternative Replacement POT

Post by clipless bumper »

yeah - the more I answered/thought about it - the more variables there were.

PCB mounted pots are a different animal than a pot you would put in a hand-wired guitar or amp.

Take/post a picture of the inside of the amp - pot in question.
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AtypicalOne
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Re: Alternative Replacement POT

Post by AtypicalOne »

OK - so I've been trying to get access to the POT so I can then post a pic for your help with identification. Sadly, I cannot figure out how to get access to behind the face-plate of the amp so I might remove the POT. What am I doing wrong? :confused: It's likely obvious, but Ce'st la Vive. Please enlighten me. :idk:

Cheers, Keith
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Re: Alternative Replacement POT

Post by clipless bumper »

Usually, you have to take the entire chassis (stamped metal enclosure that the pots/jacks are mounted to) out of the cabinet.

Normally held in be 4 bolts.
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AtypicalOne
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Re: Alternative Replacement POT

Post by AtypicalOne »

OK. I'll press on.
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Gunslinger
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Re: Alternative Replacement POT

Post by Gunslinger »

AtypicalOne wrote:OK. I'll press on.


Do you have any experience with electronics? Cause the voltages held inside the amp can be lethal, even if unplugged.
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AtypicalOne
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Re: Alternative Replacement POT

Post by AtypicalOne »

No, no I don't. Aborting mission. Now what?
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AtypicalOne
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Re: Alternative Replacement POT

Post by AtypicalOne »

Update - I decided to seek professional help. Knowing one's limits is important. One cannot push in all directions simultaneously. :bang:

Thank you for your guidance.

Kind Regards, Keith
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EugeneTheJeep
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Re: Alternative Replacement POT

Post by EugeneTheJeep »

Good decision. It's tricky soldering on PCBs sometimes and too much heat can destroy the traces.
I love Jeeps, Krav Maga, Thai Boxing and obviously Guitars.
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Modded my 50w EVH to fix green/blue volume jump
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