Looking for 4100 JCM900 Dual Reverb reissue schematics

Discussion in 'The Workbench' started by Kelia, Jan 18, 2021.

  1. Kelia

    Kelia Well-Known Member

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  2. Old Punker

    Old Punker Well-Known Member

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    Try here:

    https://www.thetubestore.com/marshall-schematics

    Looks like there is a link for your amp about 1/2 way down the page.
     
  3. Kelia

    Kelia Well-Known Member

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  4. Old Punker

    Old Punker Well-Known Member

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    I'm not an expert (so don't shoot me if I'm wrong) but I believe the JMP52 is just the drawing number. I would just use the 'DATE' field for drawing/revision date. I think the 02 is the revision number. The 'MODEL' field is for your amp (4100) and looks like the same preamp is used in both the 4100 and 4500 models.
     
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  5. IOSEPHVS

    IOSEPHVS Well-Known Member

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    Question? Do the original JCM900 4100 Dual Reverb (two different versions: EL34 and 5881) and the JCM900 4100 Reissue (5881) share the same schematic? I ask because there is an original JMP Lead 50W 1987 schematic and a Plexi Superlead Reissue 50W 1987 [1987X] schematic on the page.
     
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  6. Old Punker

    Old Punker Well-Known Member

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    I'm not an expert and the schematics on that site may be all that's available to most of us. The folks over at Marshall may have made some changes iteratively over the years that any particular model was available and it's nearly impossible to be aware of all of them. An amp tech would have a much better grasp.

    All I can suggest is use the schematic that matches your particular model + year + power tube.
     
    Last edited: Jan 19, 2021
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  7. Kelia

    Kelia Well-Known Member

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    Thanks for your input Punker !......apppreciate !
     
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  8. Old Punker

    Old Punker Well-Known Member

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    You're welcome, glad I could help.
     
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