Are you a Plexi or JTM 45 type of player?

Discussion in 'Amps and Cabs' started by MusicGearGuys, Jul 11, 2005.

  1. MusicGearGuys

    MusicGearGuys Member

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    I thought this may be fun.
    Personally I've always liked the Marshall JTM compared to the Marshall plexi.

    What tone do you prefer?

    Gregory

    Vigier/Diezel/THD
     
  2. MusicGearGuys

    MusicGearGuys Member

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    Shovelhead, how the heck are you?
    Miss ya bro.
    Gregory
     
  3. Tom CT

    Tom CT Old Supporting Member Gold Supporting Member

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    I thought JTM45s were plexi amps. Just earlier ones. Also, do you mean 50-watt or 100-watt plexis?
     
  4. MusicGearGuys

    MusicGearGuys Member

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    Thanks bro.


    Gregory
    Vigier/Diezel/THD
    dealer for Colorado USA
     
  5. Swarty

    Swarty Member

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    They are plexis... and the early non-JTM45 and JMP varieties are closer to JTM45s than say a '69 plexi, which is the same as say a '71 metal panel.
     
  6. MusicGearGuys

    MusicGearGuys Member

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    No, the Plexi is not the same at all. It has EL34's while the JTM has 6l6's.

    The JTM was Marshal's first amp made in production. The Plexi or Super Lead came later.

    I'm a EL34 fan but the JTM 45 has a amazing tone.


    Gregory
    Vigier/Diezel/THD
     
  7. MusicGearGuys

    MusicGearGuys Member

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    Anyway, regardless. Do you prefer the earlier 6l6 or the later EL34 tone?

    Gregory
     
  8. jokerjkny

    jokerjkny Member

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    straight up Plexi,

    feels more punchier and dynamic to me.
     
  9. sws1

    sws1 Member

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    A JTM is plexi-paneled, but typically when people say "plexi" they are referring to the JMP amps from 67 to early 69 (which are also plexiglass paneled).
     
  10. Garrett Bagby

    Garrett Bagby Member

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    JTM forty fizzive

    Plexi's are too loud to have any fun with.
     
  11. Laroosco!

    Laroosco! Member

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    JTM 45 with KT66's

    I'll keep my Route 66 and be plenty happy
     
  12. Red Planet

    Red Planet Member

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    Those amps are just way too loud to play with.
     
  13. Swarty

    Swarty Member

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    I guess it is just symantics, but in the circles I run in, which includes more than a few collectors of these fine old amps, a plexi is a Marshall with a plexiglass face plate. Even cream panel JTM45s are referred to as cream panel plexis. I don't even think the term "plexi" existed before 1990. Within the "plexi" genre you hare your JTM45s, your JTM100s, your JMPs...and within the JTM45s you have your metal logos, your badge logos, your script logos...and within the JMPs you have your shared cathode, your 3" mains, your 2" mains, your 1.5" mains, your 90 degree output trans, your aluminum chassis, your top mounted caps...the list of esoteric minutia goes on and on.

    FWIW, I've never heard of these amps coming with 6L6s.
     
  14. hasserl

    hasserl Member

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    I think the very first Marshalls may have come with 5881 tubes, but these were replaced with KT66's shortly afterward. The number of Marshalls produced with 5881's must be just a handfull.

    I also share Tim's opinion that Plexi refers to any Marshall amp with plexiglass panels. But there's no offical designation that I'm aware of, so call whatever you want a plexi. As long as the guy you're talking to knows what you mean, what the heck. It does make things a bit confusing though.
     
  15. 57special

    57special Silver Supporting Member

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    isn't the difference that one has a SS rectifier, and one has a tube rectifier. The former delivers about 5 more watts to the circuit, but marshall didn't get around to changing the "JTM 45" markings on their faceplates (or till they were used up) till later.
    Oh, and the correct answer to the original question is , "Both".
     
  16. The Whiz

    The Whiz Member

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  17. walrus

    walrus Member

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    Hey, anyone know why the Beatles didn't use Marshalls?

    ;)
     
  18. John Phillips

    John Phillips Member

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    Actually there is a transitional model called the JTM50 which typically has a steel chassis (almost all JTM45s have aluminum), EL34s (JTM45s have 5881/KT66s), but retains the GZ34 tube rectifier (JMP50s have solid-state). These have a black rectangular JTM (no 45) logo on the front panel.

    After that came the JMP50, which is basically the same except that it uses a solid-state rectifier. In fact, the earliest ones use exactly the same PT as the JTM50, with the filament winding unused, and still with the higher voltage secondary windings to allow for the voltage drop of the tube - without that, they deliver really high B+ voltage (over the filter cap rating), very high power, and sound amazing :).

    These two are my favorites - I think I actually like the EL34/GZ34 JTM50 best of all.

    There are also a lot of odd transitional models, and no combination of features from this (short, entirely within 1967 I think, which coincidentally is the year I was born!) period is totally impossible stock, I don't think - I've even seen a JMP50 (steel chassis/SS rec) with what appeared to be a stock JTM45 front panel, which I would guess was a left-over.


    FWIW, the term 'Plexi' or 'plastic-panel' was definitely in use over here in the mid 80s, but only by a very few specialists. I tend to use it to mean specifically the earlier JMPs, to distinguish them from the later metal-panel JMPs. JTM45s are a different thing entirely, so I think of them as 'JTM45s', not 'Plexis'. They're still plexi-panel Marshalls of course, but the other factors are more important. I do think of the JTM50 as a Plexi, though.
     
  19. trisonic

    trisonic Member

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    Well, my guess is:
    a) That they were'nt being made when they started.
    b) Later on their manager's retail shop carried Vox.
    c) Marshalls were not generally available up north in Liverpool until Jim did his deal with Rose - Morris, and then distribution was sketchy. When Marshall started it was a one shop situation, no internet!

    My views conform with John's. I believe that a JTM50 was for sale on here a few months ago.

    Best, Pete.
     
  20. Ed DeGenaro

    Ed DeGenaro Supporting Member

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    'luminum panel 100 watters, and mid 70s 50 watters of all things.
     

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