JVM410H Mods - Thanks Guys!

Discussion in 'Marshall Amps' started by JamesD, Oct 27, 2021.

  1. JamesD

    JamesD Active Member

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    Hey - just wanted to thank the forum for the helpful and useful information posted here, specifically regarding mods.

    I did the following mods on my JVM410H based on what I’d read here and it really changed the character of the amp in a killer way:


    Choke 10H (in place of R106)

    Negative feedback (changed to 176k)

    Anti-Compression (220k over R72 & R75)

    Plexi (1uf electrolytic cap over R97)

    C83 - removed


    Thanks again for posting this great info!
     
    Last edited: Oct 28, 2021
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  2. Travisl

    Travisl New Member

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    Hello! What does each mod do? I just got a new JVM 410h and really like what I have thus far but keep seeing mod posts regarding the amp. Is there a guide to do those mods? If I bring it to an amp tech would he know what to do? I have zero electrical skills, are any of them something I can do?
     
  3. Benighted

    Benighted Member

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    I have a detailed list of all JVM mods from the old site, but am not sure how to attach it to a post here. It is a PDF file.
     
  4. Benighted

    Benighted Member

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    Check the attached, it is a detailed list of all JVM mods.
     

    Attached Files:

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  5. JamesD

    JamesD Active Member

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    For some reason that attachment opens encrypted for me. @Travisl - this thread has info on the mods: https://www.marshallforum.com/threads/jvm-mods.101251/

    In short, the mods change the character of the amp to be less modern sounding and feeling, and more like the older Marshalls - more open and dynamic.

    I did the mods myself, but based on your post I’d say you should definitely take yours to a shop. There’s lethal voltage inside the amp - even when not plugged into a power source - and that voltage needs to be ‘drained’ from the amp appropriately before touching anything. It’s not worth losing your life over. I’m guessing it should be well under $200 to have all this done at a shop.
     
    Last edited: Oct 28, 2021
  6. South Park

    South Park Well-Known Member

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    Only a solder junky gets this stuff . Good job
     

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