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EML 200 pot replacement

EML 200 pot replacement

2015-02-17 by Mr. Fang

I just acquired an Electrocomp 200 with scratchy pots, and am looking for advice. The Allen-Bradley type J pots are fine, but the square cermet "mod pots" (modular potentiometers) did not survive the last few decades and can't be repaired because of the way they're constructed. For the ones that are just a single value I'm replacing them with other pots, but the problem is the two filter cutoff frequency controls, where a single shaft simultaneously turns two pots of different values (100k and 1meg). I can't find any new old stock, and to have replacements custom manufactured by potentiometer.com would cost $45 each with a $50 low volume fee and $15 shipping, so that sounds like a last resort. Anyone else have suggestions?

-thomas

Re: [emlsynth] EML 200 pot replacement

2015-02-17 by bill bigrig

Somewhere out there is a sheet that tells you how to do all sorts of things to pots by adding resistors. You could start with a dual 1 meg, add the resistors to one to cut it to the value you need. I'll try to see if I can find the sheet that I printed out long ago.

Rig
EML 500


On Tuesday, February 17, 2015 10:53 AM, "'Mr. Fang' thomas.fang@... [emlsynth]" <emlsynth@yahoogroups.com> wrote:


 
I just acquired an Electrocomp 200 with scratchy pots, and am looking for advice. The Allen-Bradley type J pots are fine, but the square cermet "mod pots" (modular potentiometers) did not survive the last few decades and can't be repaired because of the way they're constructed. For the ones that are just a single value I'm replacing them with other pots, but the problem is the two filter cutoff frequency controls, where a single shaft simultaneously turns two pots of different values (100k and 1meg). I can't find any new old stock, and to have replacements custom manufactured by potentiometer.com would cost $45 each with a $50 low volume fee and $15 shipping, so that sounds like a last resort. Anyone else have suggestions?
-thomas


RE: [emlsynth] EML 200 pot replacement

2015-02-17 by Pete

A 110Kohm resistor in parallel with the outer lugs of one 1M pot will give you a total resistance of 99.09Kohm.

 

Peter

 

From: emlsynth@yahoogroups.com [mailto:emlsynth@yahoogroups.com]
Sent: February 17, 2015 1:53 PM
To: emlsynth@yahoogroups.com
Subject: [emlsynth] EML 200 pot replacement

 

 

I just acquired an Electrocomp 200 with scratchy pots, and am looking for advice. The Allen-Bradley type J pots are fine, but the square cermet "mod pots" (modular potentiometers) did not survive the last few decades and can't be repaired because of the way they're constructed. For the ones that are just a single value I'm replacing them with other pots, but the problem is the two filter cutoff frequency controls, where a single shaft simultaneously turns two pots of different values (100k and 1meg). I can't find any new old stock, and to have replacements custom manufactured by potentiometer.com would cost $45 each with a $50 low volume fee and $15 shipping, so that sounds like a last resort. Anyone else have suggestions?

-thomas

Re: EML 200 pot replacement

2015-02-20 by Mr. Fang

As an update, I was able to spray some control cleaner into the guts of the mod pots (after removing their 4 screws and back plates) and their performance improved. It was a relief not to replace anything!

My next question, a long shot: does anyone want to part with a wooden lid for the 200, or have an extra one for some reason? Mine was lost by a previous owner.

On Feb 17, 2015 12:53 PM, "Mr. Fang" <thomas.fang@...> wrote:

I just acquired an Electrocomp 200 with scratchy pots, and am looking for advice. The Allen-Bradley type J pots are fine, but the square cermet "mod pots" (modular potentiometers) did not survive the last few decades and can't be repaired because of the way they're constructed. For the ones that are just a single value I'm replacing them with other pots, but the problem is the two filter cutoff frequency controls, where a single shaft simultaneously turns two pots of different values (100k and 1meg). I can't find any new old stock, and to have replacements custom manufactured by potentiometer.com would cost $45 each with a $50 low volume fee and $15 shipping, so that sounds like a last resort. Anyone else have suggestions?

-thomas

Re: [emlsynth] Re: EML 200 pot replacement

2015-02-20 by Nick Zampiello

i want a replacement lid too!

lol.
 
NEW ALLIANCE EAST!!!!

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On Friday, February 20, 2015 1:27 PM, "'Mr. Fang' thomas.fang@... [emlsynth]" <emlsynth@yahoogroups.com> wrote:


 
As an update, I was able to spray some control cleaner into the guts of the mod pots (after removing their 4 screws and back plates) and their performance improved. It was a relief not to replace anything!
My next question, a long shot: does anyone want to part with a wooden lid for the 200, or have an extra one for some reason? Mine was lost by a previous owner.
On Feb 17, 2015 12:53 PM, "Mr. Fang" <thomas.fang@...> wrote:
I just acquired an Electrocomp 200 with scratchy pots, and am looking for advice. The Allen-Bradley type J pots are fine, but the square cermet "mod pots" (modular potentiometers) did not survive the last few decades and can't be repaired because of the way they're constructed. For the ones that are just a single value I'm replacing them with other pots, but the problem is the two filter cutoff frequency controls, where a single shaft simultaneously turns two pots of different values (100k and 1meg). I can't find any new old stock, and to have replacements custom manufactured by potentiometer.com would cost $45 each with a $50 low volume fee and $15 shipping, so that sounds like a last resort. Anyone else have suggestions?
-thomas


Re: [emlsynth] Re: EML 200 pot replacement

2015-02-22 by bill bigrig

Gosh, now that were all here, is anyone willing to part with a 200 for a reasonable price? I just reviewed the owners manual for my 500, and it said the 200 is a dandy companion. The 400 too, but sequencing is already taken care of in my humble muzik room.
rig