marshall plexi opt replacement?mercury magnetics or obsolete electronics?

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by bmf5150, Dec 11, 2004.


  1. bmf5150

    bmf5150 Member

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    whos opt is closer to the original 68 plexi opt?mercury magnetics or obsolete electronics?
    stan
     
  2. Roccaforte Amps

    Roccaforte Amps Member

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    mercury.
     
  3. bmf5150

    bmf5150 Member

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    do you find them too bright and thin?i hear that coplaint alot?are they kind of high fi like in a good way?
    stan
     
  4. Roodboy

    Roodboy Supporting Member

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    FWIW legendarytones has a nice mercury magnetics review.
     
  5. TheAmpNerd

    TheAmpNerd Member

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    Bright and Thin....yes but that is not the tranny's fault,
    that is what the plexies were known for. You really
    have to crank them, to get beyond the bright and thin.

    The MKIIs were better at this and the Master Vol better
    followed by the JCM800 were designed to try and
    minimize the brightness/thiness of the amps.

    Enjoy, good tone.
     
  6. bmf5150

    bmf5150 Member

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    i have a cerrem tranny in my plexi clone and i think its too warm..george from metroamp.com is having heyboer making clones of the late 68 style self lead dagnal 1.5 opt.there plexi opt they have now is the early opt.im waiting to see if those are more accurate than the mercury magnetics .a well respected electical engineer on the plexi palace says the mercury magnetics are not made correctly,and that attributes to the extended highs.so we will see what happens.waiting on georges protoype and to see what he thinks when he compares them to his original dagnal.
     
  7. TheAmpNerd

    TheAmpNerd Member

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    Consider the following:

    "...the Marshall amps were so bright that they sounded downright thin for a solo guitar without a band behing it, but were still acceptable when the rest of the band was playing."

    O'Connor, K; The Ultimate Tone. (Generations of Tone). Volume 3. Power Press Publishing. London, Canada. Plexi, Page 7-1.


    And then:

    "The first prominent 800 amp was the master volume circuit that became the 2203 and 2204, 100W and 50W respectively. These used the same internal layout as the previous Plexi-styled amps but with a minor rewiring of the input stages. this wiring made all the difference [nerd note: as to the bright and thin sound], and was something techs around the world had been doing for many years."

    ibid (p8-1)


    Additional note to Fullerplast, now you should feel better that I'm including references in these posts. Lets ALL do this so we can check it all out, right?
     
  8. bmf5150

    bmf5150 Member

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    i have one of georges dagnall 1-1/2 stack self lead opt coming to me for testing.if its good he will be selling them for $130..cant beat that..i will try a mercury eventuall just to try it.so if any of you guys have used self lead 100 watter they want to sell let me know.

    stan
     
  9. hogy

    hogy Member

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    Hey AmpNerd, have you actually heard a Plexi Marshall before?

    This:

    "...the Marshall amps were so bright that they sounded downright thin for a solo guitar without a band behing it, but were still acceptable when the rest of the band was playing."

    is completely wrong.

    To the original poster, the OEI is better, but hard to get.

    Hogy
     
  10. Swarty

    Swarty Member

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    Thin sounding plexi? Me wonders were this stuff gets conjurred up?
     
  11. TheAmpNerd

    TheAmpNerd Member

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    Yes, actually I have. : )
     
  12. TheAmpNerd

    TheAmpNerd Member

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    Hmmm,

    Beats me. Could it be that the folks are only reporting
    on what they heard of these amps after the caps have all dried up?

    Thin and bright describes dried out electrolytics pretty
    darn well. Lot's of plexi's I've heard have sounded like
    this.

    That and that sucking sound that is made
    when an amp is trying to make some tone.

    Not just limited to amps either. Reverb tanks too.
    I redid a studio cat's 6G15 (Fender Reverb tank)
    that has that ****** thin reverb.

    It sounds great now.

    AND

    He doesn't need new speakers in his Fender 2 x 15
    cab. It was neither the Showman nor the cab;
    a properly working reverb tank was the cure.

    Now I've gotta 2203, Dual Showman Reverb
    and a 50 watt Lead that need work.

    I love tube stuff.

    What I've found works best in Plexi's is this:

    For the ultimate in tone, you really need
    to try the Silver Foil caps. These breed
    new life into any thin/brittle sounding amp.
    Check them out here at:

    http://www.partsconnexion.com/catalog/CapacitorsFilm.html

    I use four of the .022 x 600V
    four of the .1 x 600V

    For the mains, I use the BlackGate WKZs
    at 47uf x 47uf x 500V

    http://www.partsconnexion.com/catalog/CapacitorsElectrolytic.html

    To keep the ESR of the supply managable,
    I bypass the whole thing with
    silver foil 3.3 x 600V,
    1.0 x 600V and
    finally a .1 x 600V cap.

    These are further doubled up and wired in series
    to double their voltage handling and prevent that
    huge current and voltage inrush shock.

    I use a combination of resistors,
    most are Tantallum or Caddocks
    and I spice it up with a few Rikens
    on the plates.

    http://www.partsconnexion.com/catalog/resistors.html

    Until you've rebuilt a classic amp with these componants,
    everything else is kinda whimpy by comparison.

    Oh, and the tone you get:

    Unbelievable.

    That is why I always say, folks don't be cheap
    with your components, they make a world of
    difference.
     
  13. hogy

    hogy Member

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    Reminds me of that weird web site by that Canadian guy (is that close enough:) ).

    "Tone Lounge" or some such, where he tells you everything you need to know about tube guitar amps, and then proceeds to explain that Plexi Marshalls sound the way they do because they have an output transformer the size of a Delexe Reverb's.

    Hogy
     
  14. TheAmpNerd

    TheAmpNerd Member

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    Hogy,

    That would be on the 100 watt marshalls with the
    Deluxe Reverb sized tranny, right?

    LOL
     
  15. bmf5150

    bmf5150 Member

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    you guys ever try the rel ppt caps?i like the vishay dale millitary spec resitors in my amp thus far!
     
  16. Lonely Raven

    Lonely Raven Member

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    I'm just going to load my amp up with these, it doesn't
    need any other parts:

    ANOTE- 64081 3.3000 600V $1,389.90 Silver Foil
     
  17. Jackie Treehorn

    Jackie Treehorn Member

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    I think that anyone who uses less expensive parts than I do is making a cheap sounding, shoddy product while anyone who uses more expensive parts than me is foolish because they don't sound any better and they're plain nuts - one step away from coloring their cd's with green markers or buying power cords for four figures...

    Seriously, I'm with AmpNerd on the Riken-Ohms...those sound great. I'm really curious about the foil caps...
     
  18. bmf5150

    bmf5150 Member

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    anyone try the reliable ppt cap in there amp?im using sozo caps,am really happy with them thus far!
    stan
     

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