I have a suspected bad potentiometer on my moog rogue mod wheel. The service manual lists it as a 10k “special taper” pot. Is it just an audio taper? I see the linear taper pot for the pitch wheel here on syntaur, but not the mod wheel. Haven’t been able to find this in my searching so far.
Thanks
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I found some grainy pics of a disassembled unit and it looks like its a standard Alps pot with possible a screw attached to the pot shaft (just a guess). Syntaur has a pitch pot in stock but not a Mod pot. R161 on the service manual doesn’t say what the special taper is, so may be a custom job. Pot Tapers are either Linear or Logarithmic. You’ll have to tell us what it actually is.
there’s some discussion here;
This site says its the same part, but I don’t think so
You will most likely have to determine what’s so special about its taper and choose to replace it with something else or Frankenstein it together with another pot and see if its repaired.
If the carbon traces are broken, a last ditch repair method is to (after thoroughly cleaning) spread a very thin layer of conductive repair paste to fill in only the broken gaps in between the traces. This should restore continuity, if that’s the problem.
TL
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The Moog Prodigy uses the same potentiometer. I can measure the mod wheel potentiometer of my Prodigy later.
Thank you! interesting I was thrown off by the screw head on the shaft - mine appears to have been glued in place over that head… fun times. when I google the part number on the pot, it just points me back to the moog manual. Maybe some evidence towards a custom taper.
It’s measuring all over the place so I can’t tell the taper with my meter. I did clean w deoxit initially, no change, but I’ll at least open it up and see if I can tell what’s wrong with it, either re-use it or replace it.
I’m skeptical I’ll find anything but logarithmic (“audio”) in terms of replacement parts, but I think that will be okay - as long as it’s 10k it should “work”, but it will have different action. right? It might be a while but stay tuned!! Thanks
edit: thinking a little more about this.. the taper will be important because the way the wheel limits the sweep of the pot to a specific range. hmmm.
edit 2: also wondering if what we’re calling a screw head isn’t just a split shaft… will report back after I chip away at this old glue
Thank you! but… looking at the syntaur parts for the prodigy it looks like both the pitch and mod wheel are linear.
small update, the shaft does have a split at the top, it’s not a screw in to the shaft. the wheel pulls off (in my case after shaving a lot of old clear glue off, and of course loosening the set screw)
If the auto ranging multimeter cant read it, then the carbon tracks are either broken or internally shorted by parts failure. An analog meter or VOM may read it better, but taking it apart to find out what’s wrong is the next step.
Just curious, does it show signs of previous disassembly, if the adjustable end is covered in glue?
TL