Installing a 1980's JCM800 2204 circuit board in a 2266 Vintage Modern !

Discussion in 'Marshall Amps' started by Kelia, Nov 5, 2019.

  1. Kelia

    Kelia Well-Known Member

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    Hi guy's !.......a friend of mine has a 2204 circuit board ,......I'm tempted to have my
    tech install it in my Vintage Modern and also install a choke and tube effect loop .
    Of course ,there is some work and tweaks involved but I'm on the edge of doing it unless
    someone tells me that I'm going completely crazy !!........haha!

    If you find it a good and exciting Idea ,.........let me know what you would do with all the extra knobs and both HDR-MidBoost push buttons !?

    Thanks!
     
  2. herbvis

    herbvis Active Member

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    Dont do it! Take the $$$ that all the work would cost and get a amp kit for the board to go into instead.
     
  3. Filipe Soares

    Filipe Soares Well-Known Member

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    I agree... I think will be cheaper using a new chassis and trafos... the jvm you can sell later
     
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  4. pedecamp

    pedecamp Well-Known Member

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    Sounds expensive, sell the VM and put that cash and some more into what you really want. :yesway:
     
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  5. South Park

    South Park Well-Known Member

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    Does the circuit board work. Buy a chassis on eBay build it and have two amps
     
  6. Kelia

    Kelia Well-Known Member

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    Oh well !.......I guess you guy's are right !!

    Maybe I'm better off buying a kit and install the board in it !
    Wonder if Valvestorm sell a JCM800 kit ?
     
  7. South Park

    South Park Well-Known Member

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    You have the circuit you can source all the parts on ebay
     
    Kelia likes this.
  8. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    No don't do this.
    If you don't like the VM, sell it and buy a kit or buy something else.
     
    Mitchell Pearrow and Kelia like this.
  9. Kelia

    Kelia Well-Known Member

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    Thanks !...........that's what I'll do !
     
    Last edited: Nov 6, 2019 at 6:31 PM
    Mitchell Pearrow likes this.
  10. Kelia

    Kelia Well-Known Member

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    Hello again !.................even though you guys advise me not to go forward
    with this project ,........I have a remaining question that I need to ask !

    Very curious to know if the Vintage Modern's output transformer good enough for the 2204 conversion mod ?

    Thanks !
     
    Last edited: Nov 10, 2019 at 3:31 PM
  11. herbvis

    herbvis Active Member

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    If I remember correctly, The VM has a much higher voltage going on than a 2203/800
     
  12. anitoli

    anitoli Well-Known Member

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  13. Kelia

    Kelia Well-Known Member

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    Mine has 455v on the plates ?
     
  14. Kelia

    Kelia Well-Known Member

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    Last edited: Nov 10, 2019 at 6:34 PM
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  15. 67mike

    67mike Well-Known Member

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    Keep the vm....buy a chasis and build the 2204
     
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  16. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Clearly you have lost your mind.

    Why don't you just sell the VM and buy a 2204?:rolleyes: Some type of medication, perhaps?
     
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  17. Gunner64

    Gunner64 Well-Known Member Premium Member

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    I wouldn't destroy the vm if its working properly, and can still fetch the value it's worth..now if it was smoked and unrepairable I'd say go for it, but as it is I would source a chassis and parts and build clone. The vm is not the amp for you..sell it and build/buy a 2204..don't turn it into a bastardized wanna be 2204 that never quite will be what you want it to be anyway..just my 2 cents.
     
  18. Kelia

    Kelia Well-Known Member

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    Ya !...........I guess I need to take some pills !!........going nuts !!
    [​IMG]

    Thank Ams and Gunner,..........I'll will go the 2204 build route but I think I will have my tech
    see if he can improve the VM tone and feel wise ..!......I love what this guy did with his ,......the amp feels 10 times more responsive to the guitar volume and when he pushes the mid knob at around 1.30 minutes,...at least it doesn't sound like if he was kicking in another type of amp !!
    The Vintage Modern is a great amp but is lacking something imo and I believe that with a few tweaks,.it would be perfect !

     
  19. Kelia

    Kelia Well-Known Member

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  20. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Well it's like different preamp tube combinations can make a huge change in the tone of the amp.
    And so before you go slashing / burning, try some variety of different preamp tubes.
    Preamp tubes do not all sound the same, there is very large differences. The difference can be like night and day.

    And: I will make you an offer $$$ if you want to sell the old board that you take out of the amp.
    But I'm trying to convince you that it's a bad idea to rip up your VM.
     
    Last edited: Nov 11, 2019 at 9:30 AM

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