1. A proposal is now up as a poll to change the guidelines of TGP to only allow member self-deleting of post/threads for up to thirty days of the original posting it. We are now watching the poll here. Click here to view the thread.

    Dismiss Notice

Marshall fans, I have a question...

Discussion in 'Amps and Cabs' started by Clickjack, May 17, 2011.

  1. Clickjack

    Clickjack Member

    Messages:
    358
    Joined:
    Mar 11, 2010
    Location:
    Los Angeles
    What's the Differnce between a late 60's (say 68) 100w Super Lead & an early 70's JMP 100w Super Lead (say 72 - 74)?
     
  2. scriptphase

    scriptphase Member

    Messages:
    770
    Joined:
    Apr 5, 2007
    Location:
    Alamogordo, New Mexico
    It's mainly in the filtering and transformer changes.
     
  3. indeedido

    indeedido Supporting Member

    Messages:
    1,191
    Joined:
    Mar 12, 2010
    Location:
    Where the wind comes sweeping down the plains
    Yes, and the '70s models are said to have a bit more gain.
     
  4. ksandvik

    ksandvik Member

    Messages:
    6,334
    Joined:
    Mar 25, 2010
    Location:
    SF Bay Area
    ...and the seventies assembly still have variable components so the units differ from one to the other... Which I think is the charm of old Marshall amps. They all are unique.
     
  5. Wizard of Ozz

    Wizard of Ozz Silver Supporting Member

    Messages:
    2,255
    Joined:
    Aug 16, 2002
    Location:
    The Gates of Hell
    The early '70s metal panels have a bit more perceived gain and agressiveness. It's really hard to make general statements regarding these amps, as there's a huge amount of variance. I've owned several and there can be a night and day difference between them.
     
  6. sixty2strat

    sixty2strat Member

    Messages:
    10,474
    Joined:
    Feb 16, 2007
    About 3000 dollars :). They are really different but still so close, your really splitting hairs. after having used JMP's since 83 I can get plexi tones from them. In the end that what matters
     
  7. tonedawg

    tonedawg Member

    Messages:
    127
    Joined:
    Sep 6, 2007
    both are PTP but the mid sixties or early marshalls are tube rectified and the 70s are solid state
     
  8. lang.murphy

    lang.murphy Member

    Messages:
    3,564
    Joined:
    Dec 9, 2009
    Location:
    Lawrenceville, GA
    '73 was the transition year from turret board to PCB main boards. Some early '73's are turret board and at some point PCB's started production. The turret board amps usually get a couple hundred more than PCB's although I have a '73 PCB and I love it.
     
  9. Shiny_Beast

    Shiny_Beast Supporting Member

    Messages:
    8,486
    Joined:
    Apr 27, 2009
    Location:
    Ottawa Canada
    In general they seemed to start out more loose and bassy with less gain and became edgier with more gain and top end.
     
  10. Randy

    Randy Member

    Messages:
    3,885
    Joined:
    Sep 9, 2002
    Location:
    CT
    A '68 would have less filtering and would be warmer and looser then a 70's circuit.

    My understanding is by the time of the '69 metal panels, the circuit and filtering stayed pretty consistent through the early 70's, but the component choices made some difference in gain and brightness (ie Philips mustard caps vs. yellow chicklets, carbon comp vs metal resistors etc..).
     
  11. Clickjack

    Clickjack Member

    Messages:
    358
    Joined:
    Mar 11, 2010
    Location:
    Los Angeles
  12. Lespaulsignature 74

    Lespaulsignature 74 Silver Supporting Member

    Messages:
    4,434
    Joined:
    Oct 24, 2008
    Location:
    Bronx, New York
  13. Clickjack

    Clickjack Member

    Messages:
    358
    Joined:
    Mar 11, 2010
    Location:
    Los Angeles
    I think you're right. So point to point.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice