4104 Combo - Bass Pot Has No Detent

Discussion in 'The Workbench' started by bloodspoint, Jan 10, 2017.

  1. bloodspoint

    bloodspoint Member

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    Hi,

    I recently came into possession of an '85 4104 combo which sounds amazing, but it has one issue - the bass pot has no detents. It's not unusable like this, and I just set it where it sounds good anyway, but I'm thinking I might want to replace it, if only for completeness sake.
    This is the horizontal input model, with chassis mounted pots and jacks. Does anyone know what the bass pot value is, and where's a good source for one?

    Thanks,

    Sean
     
  2. JCarno

    JCarno Well-Known Member

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    1M. I got a whole set from ebay. Don't remember the exact store. Do a little searching, you'll find one. Good Luck!! :cheers:
     
  3. bloodspoint

    bloodspoint Member

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    Are they 1m audio or linear? Do I need to search anything specific for the fact that they're PCB mounted?

    Thanks!
     
  4. JCarno

    JCarno Well-Known Member

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    Sorry, missed the PCB part. Not sure what you need. The one I replaced says 1M Log.
     
  5. RickyLee

    RickyLee Well-Known Member VIP Member

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    With detent, do yu mean a spot in the pots travel where it clicks into place? Like maybe in the center position?
     
  6. bloodspoint

    bloodspoint Member

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    Hi Ricky,
    No, I mean like, it has no 0 or 10. It spins around freely. Yet, it does affect frequency, so I think it's just the stop or whatever that has broken.
     
  7. RickyLee

    RickyLee Well-Known Member VIP Member

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    Oh, I see. Yeah, that would be annoying for sure.

    Yeah, you would want to go with a 1MEG audio or LOG. And then if it is PCB mounted, yeah you need that type.

    BUT . . I have used standard type or non PCB mount where it had a PCB mount originally and just ran small lengths of wire from the lugs to the PCB. I had a quality pot on hand and that is why I did it that way
     
  8. bloodspoint

    bloodspoint Member

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    Good point. I may have a couple normal 1M pots here.
     
  9. ampmadscientist

    ampmadscientist Well-Known Member

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    On the wrong side of the tracks.
    1. Call Marshall USA and find the correct part number.
    Kevin (Kdog) Drury

    Marshall USA Service

    1000 Corporate Grove Dr.

    Buffalo Grove, IL 60089
    800-877-6863

    2. Order the correct part. You can get this from a Marshall dealer, or a source such as Antique Electronics Supply.
    https://www.tubesandmore.com/products/potentiometers_0?filters=Brand=Marshall

    3. The circuit board is easily damaged.
    You might want to hire a professional to install it.


     

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