Author Topic: Vintage Potentiometer repair DIY article  (Read 15465 times)

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analogmike

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DIY has unpleasant realities, such as that an operating soldering iron has two ends differing markedly in the degree of comfort with which they can be grasped. - J. Smith

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Bernardduur

Vintage Potentiometer repair DIY article
« Reply #1 on: August 13, 2005, 04:11:01 PM »
Nice article. Thanks!
Am learning something new every day here

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petemoore

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« Reply #2 on: August 13, 2005, 06:55:53 PM »
Nice Read, great Pics, I couldn't make out any transistor types  :D .
  I've reclamped pot bottoms, sometimes it works out great, just the right set of slipjoint pliers made it pretty easy.
Convention creates following, following creates convention.

Paul Marossy

Vintage Potentiometer repair DIY article
« Reply #3 on: August 13, 2005, 09:46:09 PM »
Oh darn, I thought you had some magical cure for a scratchy pot.  :wink:
I have tried rebuilding a couple of old pots, but the scratchiness never went away - but they were really clean and operated very smoothly after I was done with them!

analogmike

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Vintage Potentiometer repair DIY article
« Reply #4 on: August 14, 2005, 02:19:18 PM »
Hi,

The scratchiness may be impossible to fix without replacing the conductive ring in the pot. The carbon gets worn and causes scratchy sounds. The carbon rings are replaceable on the old ones if you don't want to change the pot's date code.

The transistors used in the originals and the clone I made are F (fairchild) button type 2N3566. I was able to get them at the electronics parts store 10 years ago (NOS). I have also seen metal can SM 07027 type in 1967 models.

Have fun!
DIY has unpleasant realities, such as that an operating soldering iron has two ends differing markedly in the degree of comfort with which they can be grasped. - J. Smith

mike  ~^v^~ aNaLoG.MaN ~^v^~   vintage guitar effects

http://www.analogman.com

Paul Marossy

Vintage Potentiometer repair DIY article
« Reply #5 on: August 14, 2005, 06:07:28 PM »
Quote
The carbon rings are replaceable on the old ones if you don't want to change the pot's date code.


Really?! Well, how do you get some replacements?

analogmike

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Vintage Potentiometer repair DIY article
« Reply #6 on: August 14, 2005, 10:49:45 PM »
Quote from: Paul Marossy
Quote
The carbon rings are replaceable on the old ones if you don't want to change the pot's date code.


Really?! Well, how do you get some replacements?


Same way you replace the plastic shafts on broken EH pots- cannibalism.

But you need the same pot value in this case so very tough to do.
DIY has unpleasant realities, such as that an operating soldering iron has two ends differing markedly in the degree of comfort with which they can be grasped. - J. Smith

mike  ~^v^~ aNaLoG.MaN ~^v^~   vintage guitar effects

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mudmen

Vintage Potentiometer repair DIY article
« Reply #7 on: August 15, 2005, 07:47:24 AM »
This letter with 'David Gilmour Music Limited' looks pretty interesting ;)
Is it his pedal ?
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aaronkessman

Vintage Potentiometer repair DIY article
« Reply #8 on: August 15, 2005, 10:49:46 AM »
er, how exactly DO You replace the plastic shafts on broken EH pots? I've never seen a plastic shafted pot that big anywhere but EH boxes...

analogmike

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Vintage Potentiometer repair DIY article
« Reply #9 on: August 15, 2005, 11:00:01 AM »
Quote from: mudmen
This letter with 'David Gilmour Music Limited' looks pretty interesting ;)
Is it his pedal ?


Not a very subtle hint, was it?  :D

I have had to use broken donor EH pedals to cannibalize the plastic shafts to fix other pedals. I dont know where you can buy those either but I bet CTS still makes them for someone...

good luck!
DIY has unpleasant realities, such as that an operating soldering iron has two ends differing markedly in the degree of comfort with which they can be grasped. - J. Smith

mike  ~^v^~ aNaLoG.MaN ~^v^~   vintage guitar effects

http://www.analogman.com

Paul Marossy

Vintage Potentiometer repair DIY article
« Reply #10 on: August 15, 2005, 11:14:44 AM »
Quote
Same way you replace the plastic shafts on broken EH pots- cannibalism.


Oh, I see.  8)

mudmen

Vintage Potentiometer repair DIY article
« Reply #11 on: August 15, 2005, 11:40:40 AM »
Quote from: analogmike

Not a very subtle hint, was it?  :D


Have you repaired any other pedals for him ? :)
David Gilmour :: Gear Forum
http://www.davidgilmour.pq.pl

Doug_H

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Vintage Potentiometer repair DIY article
« Reply #12 on: August 15, 2005, 12:05:58 PM »
It figures that one of the progenitors of "space rock" would need an "Astro Tone" pedal... :lol:

Doug

mudmen

Vintage Potentiometer repair DIY article
« Reply #13 on: August 15, 2005, 12:12:08 PM »
Yeah, there's even a Floyd bootleg called 'The Band Who Ate Asteroids For Breakfast' :)
David Gilmour :: Gear Forum
http://www.davidgilmour.pq.pl

analogmike

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Vintage Potentiometer repair DIY article
« Reply #14 on: August 15, 2005, 02:48:58 PM »
Quote from: mudmen
Quote from: analogmike

Not a very subtle hint, was it?  :D


Have you repaired any other pedals for him ? :)


He has a pile of weak old fuzzfaces, was considering repair but rather than messing with them I sent him an NKT275 sunface and one with vintage BC108C, I hope he likes them!
DIY has unpleasant realities, such as that an operating soldering iron has two ends differing markedly in the degree of comfort with which they can be grasped. - J. Smith

mike  ~^v^~ aNaLoG.MaN ~^v^~   vintage guitar effects

http://www.analogman.com

yeeshkul

Re: Vintage Potentiometer repair DIY article
« Reply #15 on: October 01, 2006, 10:00:14 AM »
Guys does anyone have schematics for the Astrotone fuzz box above?
I don't believe anything i haven't measured with my RoHS friendly Chinese multimeter.

alfafalfa

Re: Vintage Potentiometer repair DIY article
« Reply #16 on: October 01, 2006, 10:25:37 AM »
Have a look on R .G. Keen's site !!

http://www.geofex.com/FX_images/samash.gif

Alfafalfa

markm

Re: Vintage Potentiometer repair DIY article
« Reply #17 on: October 01, 2006, 11:19:16 AM »
Although this thread is from last year, just wanted to say thanks Mike for a very interesting article.

analogmike

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Re: Vintage Potentiometer repair DIY article
« Reply #18 on: October 01, 2006, 12:27:12 PM »
You are welcome!

Here is my NOS Sam Ash Fuzzz Boxxxxx along with a few more old fuzz pedals, rounded up for a FUZZ documentary last week.

DIY has unpleasant realities, such as that an operating soldering iron has two ends differing markedly in the degree of comfort with which they can be grasped. - J. Smith

mike  ~^v^~ aNaLoG.MaN ~^v^~   vintage guitar effects

http://www.analogman.com

Marcos - Munky

Re: Vintage Potentiometer repair DIY article
« Reply #19 on: October 01, 2006, 12:40:31 PM »
Wow, this is really a great pedal collection :icon_eek: :icon_eek: :icon_eek: :icon_evil: :icon_evil: :icon_evil:.