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Potentiometer repairs/rebuild


ebenezer
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Yes and no. They can be dismantled (pry open the tabs holding the back of the case on), wiped out and apply fresh silicone grease, but if the carbon tracks are worn or cracked then it’s not really worth it. Unfortunately it’s not something you can know until you’ve got the back off, good skill to have though.

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From my experience of a few vintage instruments I would be very wary of old pots that worked perfectly. You can take the old pots and replace the insides with a new pot and reseal the old case to make it look original. This happened to a friend of mine who bought a vintage bass. I would prefer a seller to replace the scratchy pots and provide the originals as well.

 

I would leave them as they are.

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I really don't get what all the fuss is about.  Why is there this fascination with having the original, shagged out pots anyway?  It's this kind of counter-intuitive stuff that drives people to put new innards in old pot casings.   Pots die, it's a fact of life and heavy use.  Replacing them is the sign of a well looked after and maintained instrument, no?

 

I'm pretty sure even the most... invested classic car enthusiast isn't that concerned with having the original, factory installed spark plugs in the engine, are they?  Or have I just opened up an entirely new and even wrigglier can of worms? :D

 

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21 minutes ago, neepheid said:

I really don't get what all the fuss is about.  Why is there this fascination with having the original, shagged out pots anyway?  It's this kind of counter-intuitive stuff that drives people to put new innards in old pot casings.   Pots die, it's a fact of life and heavy use.  Replacing them is the sign of a well looked after and maintained instrument, no?

 

I'm pretty sure even the most... invested classic car enthusiast isn't that concerned with having the original, factory installed spark plugs in the engine, are they?  Or have I just opened up an entirely new and even wrigglier can of worms? :D

 

 

 

Wait until you meet the "that looks too fresh to be original '64 solder" brigade....

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3 hours ago, ebenezer said:

All three pots on my 79 musicman have been replaced...I still have the worn out original pots, can these  be rebuilt ?... is there a company that can do this?....thanks

 

Leading on from my earlier point - why bother?  You've got a working bass - you've kept the old pots for the "provenance" or whatever psychotic requirements will be brought to bear whenever you sell it.  What's the problem now?

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32 minutes ago, neepheid said:

 

Leading on from my earlier point - why bother?  You've got a working bass - you've kept the old pots for the "provenance" or whatever psychotic requirements will be brought to bear whenever you sell it.  What's the problem now?

 

Just needs a bit more aging with a belt sander maybe?

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5 hours ago, neepheid said:

I'm pretty sure even the most... invested classic car enthusiast isn't that concerned with having the original, factory installed spark plugs in the engine, are they?  Or have I just opened up an entirely new and even wrigglier can of worms? :D

 

Well, actually...

 

Sorry this is a bit vague, I read it all thirty years ago or more. Can't remember what model of car it was but it was a car used in a famous rally or endurance race, during which it was crashed and a chassis rail damaged. As a temporary repair, a length of angle iron or similar was welded in, and after the race the chassis was properly repaired. The car was up for sale, and included was the length of angle iron that had been welded in. 

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I recently disassembled and reconditioned the original 3P4T rotary switch in a 1973 EB-3, and I can confirm that those old components can be taken apart relatively easily so long as you have the right tools (surgical hemostats are the answer to many things). However, I only did this because the switch is an unusual type and comparable modern replacements don't really exist (just cheap sealed plastic ones that in my experience break within a few weeks). I wouldn't bother with bog standard components like pots.

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1 hour ago, police squad said:

I repaired a volume pot on my 1964 Hofner last week. Prized off the cover plate and the bits inside the pot looked good, they just weren't touching.

A wiggle with some pliers and presto, working again

put the base plate back on and instead of rivets, inserted some wire and twisted it, to hold it together

 

Well, that's just knocked a hundred quid off its value ;)

 

Or added to it, if you're famous...

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14 minutes ago, police squad said:

why? It didnt work and now it does

 

I'm being sarcastic.  To some, you've committed some heinous violation of the originality of your bass.  Me, I don't care, it's not my bass.  But you fixed it and I applaud that.

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29 minutes ago, neepheid said:

 

I'm being sarcastic.  To some, you've committed some heinous violation of the originality of your bass.  Me, I don't care, it's not my bass.  But you fixed it and I applaud that.

cool but actually what I've done is keep it original by mending it. Someone else would have changed the pot. They are a strange looking pot, not like a CTS or anything

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33 minutes ago, police squad said:

not like a CTS or anything

You can be thankful for that. Like most of the parts on the Early Fender basses and 6 string cheese slicers, the parts were what Leo could get locally. That of course includes the woods. So no magic, just what he could get easily and cost effectively.

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22 hours ago, ebenezer said:

Do I just leave as is, and just keep the original pots?

 

This in a nutshell.  

 

I know there's people that want things 100% original, but it's pots and cap(s).  As soon as you take them apart and repair/upgrade/change the innards you're losing originality.

 

Pots are one small facet in the signal chain; apart from the immense sense of wellbeing you'll get, nobody else will care in the slightest.  Trust me.

 

 

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