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Replacement Mesa Boogie volume pot with wrong value?

Discussion in 'Amps and Cabs [BG]' started by ficelles, Nov 25, 2017.


  1. ficelles

    ficelles

    Feb 28, 2010
    Devon, England
    Slightly off-topic dumb amp electronics question as this is for a guitar amp, namely a Mesa Boogie Nomad 45:

    Main volume pot pretty much dead (horrendous crackle, cutout etc), should be 100k Linear according to the Mesa part number.

    I want to replace it tomorrow (Sunday) temporarily and the closest I can find in my spares box is either a cheap 100KA from a Schaller double bass pickup, or an unused 250KB supplied by Mesa ages back for a Subway Blues. Will the 250KB be really too much the wrong thing? The 100KA looks like it will melt, although I know it probably won’t...
     
  2. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    100K-A is the best substitute, but if you call the factory on Monday, they have the correct replacement available.
     
    Old Garage-Bander likes this.
  3. ficelles

    ficelles

    Feb 28, 2010
    Devon, England
    Thanks, I was going to get the correct part but want to do more fault tracing tomorrow to see if I will need to order anything else, I will go with the Schaller pot for now. Your advice is always appreciated :)
     
    Old Garage-Bander and agedhorse like this.
  4. A volume pot normally has an audio/log taper why the linear?
     
  5. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Depends in the circuit it's being used in. It's possible to load a linear pot so it behaves log like.
     
    Passinwind and BassmanPaul like this.
  6. ficelles

    ficelles

    Feb 28, 2010
    Devon, England
    Update to this... being in England I don’t talk direct with Mesa but go through their dealer Westside Distribution in Scotland, who as always were a total pleasure to deal with and paid as much attention to a low-value order for a couple of potentiometers from an occasional non-trade customer as you would expect them to give a main dealer. Kudos. And amp now all fixed of course :)
     
    Last edited: Dec 1, 2017
    agedhorse likes this.

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