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Marshall 2204 Pre PI MV to Post PI

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by JammyDodger, May 19, 2011.

  1. JammyDodger

    JammyDodger Silver Supporting Member

    Messages:
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    Joined:
    Sep 9, 2007
    Location:
    Placerville, CA
    Hey All,

    Is it worthwhile changing the pre P.I. Master Volume on my Marshall 2204 to a Post P.I.? This is a simple change but I was wondering if there would be enough tonal difference to make it worthwhile.

    Any thoughts?

    Cheers, Mike
     
  2. phsyconoodler

    phsyconoodler Member

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    Jul 11, 2005
    Location:
    calgary canada
    Only if you use a Lar-Mar style of master.A type 1 master works too but the Lar-Mar is the best in a Marshall amp IMHO.To make it totally reverseable,install the pot in the extra speaker jack on the rear.
    I don't think you will do back flips either way.
     
  3. big mike

    big mike House Plexi Staff Member

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    Location:
    Oakland
    Leave the stock one and add the Lar/Mar.

    They won't counter act each other, and the Lar/Mar is transparent when dimed.
     
  4. Ronsonic

    Ronsonic Member

    Messages:
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    May 14, 2006
    Location:
    Sunny Tampa, Florida
    IMO, just doing the PPIMV for those amps does not leave you with a good balance. The lo gain input is still too low and the hi gain too high.

    My personal main amp is a 4104, the 2x12 combo version. Mine has a PPIMV, but also the front end rewired so that the lo gain channel emulates a normal Marshall input and the Hi is just a bit of boost over that.
     
  5. LowellH

    LowellH Member

    Messages:
    221
    Joined:
    Jun 27, 2005
    Location:
    Surprise, AZ
    PPIMV won't hurt anything but IMO is not necessary on these amps unless you also change the preamp circuitry as Ronsonic suggests.
     

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