Is there any difference between a '78 and '81 2104 JMP 50 combo?

Discussion in 'Amps and Cabs' started by michael.e, Jan 22, 2015.

  1. michael.e

    michael.e Supporting Member

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    Is there much difference between these two amps? Any component changes? I am considering an '81 combo.

    Thanks
     
  2. Beng2040

    Beng2040 Supporting Member

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    Not sure of the differences but I have a 79 combo...get it! It's a great amp!
     
  3. cardinal

    cardinal Member

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    Mustard caps vs. whatever more modern stuff they use now. Probably different speakers too.
     
  4. telewacker

    telewacker Member

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    '79 doesn't have mustards.

    Edit; Jeez looking at my laptop from a distance...I see it's '78 not '79. My bad
     
    Last edited: Jan 22, 2015
  5. Miracle Man

    Miracle Man Member

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    The 81 might have higher plate voltage, like the later JCM800 amps. I say "might" because I have a JCM800 2204 with 70s style low plate voltage so they still had some stock to use up. The 70s 50w models had about 370V on the plates (my amp has around 365V) while the 80s amps had around 440V. 81 seems to be the transition year. That will make a difference.

    And like someone else said, the early ones had the mustard caps, while the later ones had "lego" caps. Hard to say which are better, since this is subjective. In my experience, the Mustard type caps (and Sozo replicas) are much more suited for non master volume marshall, but they don't sound so great in a master model. I bought a 2203 with Sozos and replaced them with Wima caps after two days.
     

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