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  • Mod Troubles !

    Hey guys--Im tinkering with a Marshall project . Ive changed the preamp to drive the tone stack from V2 plate , instead of the usual V2 cathode.

    Other than changing a lot around V1 / V2 , I have not touched anything after the slope resistor. Its the stock 2203 Marshall tone stack and pots . The amp sounds REALLY good by the way.


    So the tone controls are acting really funky ....

    The bass works perfect , the presence is fine.

    The treble control doesnt do anything at all !

    The mid now acts as the Treble control !

    again, i havent touched that area of the circuit .

    So what am I missing ? Is it nesecary to re-wire the stack with this style circuit ??

    I will include a basic scem of what I have here:



    http://img.photobucket.com/albums/v2...psd8a5a330.jpg
    Attached Files
    Last edited by tboy; 01-23-2013, 06:19 AM. Reason: removed excess space

  • #2
    That doesn't look quite right; the left end of the treble cap should connect to the plate of V2.
    -tb

    "If you're the only person I irritate with my choice of words today I'll be surprised" Chuck H.

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    • #3
      just ran a jumper for that----Bingo ! controls work great now ----- THANKS

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      • #4
        Supposed to look like this to make that work
        Attached Files
        Last edited by Bruce / Mission Amps; 01-23-2013, 06:02 PM.
        Bruce

        Mission Amps
        Denver, CO. 80022
        www.missionamps.com
        303-955-2412

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        • #5
          Originally posted by Bruce / Mission Amps View Post
          Supposed to look like this to make that work
          I've never seen that. Shouldn't both .022's be on the other side of the slope?

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          • #6
            Originally posted by daz View Post
            I've never seen that. Shouldn't both .022's be on the other side of the slope?
            DOH!! yes.
            Bruce

            Mission Amps
            Denver, CO. 80022
            www.missionamps.com
            303-955-2412

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            • #7
              Originally posted by Bruce / Mission Amps View Post
              DOH!! yes.
              LOL! I knew you obviously know that, but just had to point out your drawing mistake so you could slap your forehead.

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              • #8
                What Bruce said in the last version.
                Juan Manuel Fahey

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                • #9
                  The amp turned out........incredible.

                  If you ever want to try hot rodding a marshall style preamp.........try the plate driven stack. Wow

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