Considering 1977 Jmp Marshall 2100 Master Volume Combo

Discussion in 'Marshall Amps' started by lovehifi, Sep 17, 2018.

  1. lovehifi

    lovehifi Active Member

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    Going to go check out and possibly buy a 1977 Marshall JMP 50 watt combo. It’s the 2100 model with master volume, two inputs and two 12 inch Marshall labeled black back speakers. Is there anything I should look for that might be signs of issues? It’s also supposed to be all original. Also any opinions or thoughts about this model would be great. Thanks
     
  2. Geeze

    Geeze Well-Known Member

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    I bought that exact model in a '78 version. Other than the usual bias and possible cap job the only thing to know is the chassis hole spacing is about an 1/8" off from the other 50 watt chassis. So if you plan to put it in a head shell like I did don't buy a pre drilled one.

    It's a great amp and if the bright cap is snipped put it back in circuit - it's one of the great things about this amp.

    Russ
     
  3. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

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    I basically had the same amp, 78-79, not sure 2104 212 combo MV ran as a full stack, regret that I sold it every time I hear someone else getting one:(
     
  4. Ray Ramadon III

    Ray Ramadon III New Member

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    Last edited: Oct 21, 2021
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  5. Ray Ramadon III

    Ray Ramadon III New Member

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    Bump I just scored one 2 days ago.

    1977 2x12 combo mkii 50 watt model #2100mv!!

    Sounds killer, but mine while just playing today the treble cut off a little it was noticeable to me and a friend immediately and I noticed the treble pot stopped functioning altogether. I also noticed my chassis is stamped on what tubes I’m supposed to use, which I’ve never seen before. Although it says 6550 mine does have EL34s must have been modded for EL34s, ether way it now appears treble pot is non functional.

    Any help with anything in these pictures let me know I’m fully covered on getting it repaired or looked at.
     
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  6. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member VIP Member

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    That’s what mine looked like.
    I have no clue about the treble pot though, maybe try cleaning it out with deoxit ?
    Cheers
     
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  7. Comfort Cove

    Comfort Cove Member

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    Little pink wires for you and me. Yep. Period correct tone stack wiring too.
     
  8. Ray Ramadon III

    Ray Ramadon III New Member

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    Thanks it’s at the shop now and will see what’s going on for sure. Also the treble pot from looking from inside the chassis seems to be the only pot different form all others?
    Ether way it’s going to be tuned back up I’ll let you all know what transpires. Thanks again.
     
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  9. Kim Lucky Day

    Kim Lucky Day Well-Known Member Gold Supporting Member

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    Looks just like mine (a '78)...awesome amp, congrats!
     

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