Join Strat-Talk Today

Marshall JCM 800 2203 , 1985

Discussion in 'Amp Input - Normal or Bright' started by Trojanhead, Jan 16, 2019.

  1. Trojanhead

    Trojanhead Strat-Talk Member

    Messages:
    83
    Joined:
    Jun 30, 2014
    Location:
    Indiana
    image.jpg Who knows these amps ?

    Just picked this up and it’s a monster!
    Opened it up to discover the output transformer had been changed

    How does that effect value ?
    Although it sounds amazing , I wonder how that may have changed the tone?
    It’s horizontal input vs vertical

    Opinions , info , experiences, thanks
     

    Attached Files:

    Robins likes this.
  2. candyapple1964

    candyapple1964 Senior Stratmaster

    Messages:
    1,666
    Joined:
    Mar 9, 2014
    Location:
    Australia
    So long as the transformer is a good one it matters not. The 1985 models are not _that_ collectable yet. So long as it roars thats all that matters.

    Your is likely a channel switcher all good very usable and versatile.

    Sent from my SM-G955F using Tapatalk
     
  3. Trojanhead

    Trojanhead Strat-Talk Member

    Messages:
    83
    Joined:
    Jun 30, 2014
    Location:
    Indiana
    Single channel
     
  4. bluejazzoid

    bluejazzoid Strats Amore Strat-Talk Supporter

    Messages:
    5,289
    Joined:
    Aug 14, 2009
    Location:
    Southeast USA
    I used to have a 4010 combo (50w 112) and those amps are bonafide beasts! Congrats - crank that thing and watch the spiders run from your house like Hagrid's hut! :D
     
    Trojanhead likes this.
  5. Stark

    Stark Nobody.... Strat-Talk Supporter

    Age:
    49
    Messages:
    14,563
    Joined:
    Jul 16, 2011
    Location:
    Richmond Annex, CA
    Let it roar and howl!
     
  6. Shortstop

    Shortstop Strat-Talk Member

    Messages:
    92
    Joined:
    Nov 27, 2012
    Location:
    Tremolonia
    Congrats!
    If it sounds amazing, keep it.
    Whether the output tranny has changed the tone depends on what the replacement is. Are there any markings on it?
    Marshall used Drake and Dagnall, depending on what was available.
    It's likely that other parts has been replaced as a result of the original tranny blowing.
    If the repairs are done professionally it won't affect the value that much but originality always brings more money.
     
    Trojanhead likes this.
  7. Stevem

    Stevem Senior Stratmaster

    Messages:
    1,089
    Joined:
    Sep 3, 2014
    Location:
    NY
    The original OTs in those amps are nothing special so no change will likely be heard!

    When playing these amps cranked it sounds better to run them into a 16 ohm load since your then using the OTs full winding and as such it eases the current load on these windings .

    What might also make a improvement is to change out all 3 of those original green power supply filters and then bring the new ones up slowly over the course of a day by means of a veriac.

    Those Russain made Mesa labeled output tubes are not the best either if your going to play the amp near cranked all the time!
     
    Trojanhead likes this.
  8. Swampash

    Swampash Senior Stratmaster

    Messages:
    2,086
    Joined:
    Jun 13, 2012
    Location:
    Here
    My first Marshall.
     
  9. carver

    carver The East Coast Strangler Strat-Talk Supporter

    Messages:
    14,688
    Joined:
    Jul 19, 2011
    Location:
    A van down by the river / Canada

    this is interesting to see.

    pretty much every amp guy I have known claims the ot and pt are a major part of the way the amps react.
     
  10. Robins

    Robins Dr. von Loudster Strat-Talk Supporter

    Messages:
    11,911
    Joined:
    Dec 22, 2010
    Location:
    Germany
    The OT makes or breaks the sound of any Marshall.
    Your JCM800 looks absolutely fantastic. Great condition.
    2nd generation (well, 3rd including the early Superleads starting the legendary 2203 series).
    What makes you think someone changed the OT?
    Are there any sign or markings on the bells?

    All the best,
    Robin
     
    Vic Interceptor and carver like this.
  11. carver

    carver The East Coast Strangler Strat-Talk Supporter

    Messages:
    14,688
    Joined:
    Jul 19, 2011
    Location:
    A van down by the river / Canada
    thank you, I dont feel crazy anymore.
     
  12. bluejazzoid

    bluejazzoid Strats Amore Strat-Talk Supporter

    Messages:
    5,289
    Joined:
    Aug 14, 2009
    Location:
    Southeast USA
    Aren't those the original mounting holes for the OT... or are those for something else?

    upload_2019-1-18_9-43-3.png

    Shouldn't it look like this?

    upload_2019-1-18_9-56-23.png
     
  13. Robins

    Robins Dr. von Loudster Strat-Talk Supporter

    Messages:
    11,911
    Joined:
    Dec 22, 2010
    Location:
    Germany
    I didn´t even noticed the holes, sorry.
    Most probably you are right but the transformer still looks right for a Marshall of those years.
    You have the green LCR caps in there which mostly appeared in canadian amps.
    That makes me curious.
    Is it all original or was it modded somehow?
    It would be great if you can make a pic of the PCB and internal gut shots.
    Thanks in advance.
    Great amp no matter what.

    All the best,
    Robin
     
    Last edited: Jan 18, 2019
    carver likes this.
  14. carver

    carver The East Coast Strangler Strat-Talk Supporter

    Messages:
    14,688
    Joined:
    Jul 19, 2011
    Location:
    A van down by the river / Canada
    I wonder if the canadian builds used hammond parts or something and they stuck them on a chasis that was drilled for the eu stuff? I really dont know. this is just a hair brained idea. just thinking.. not fact. not myth. nothing more. nothing less.
     
  15. bluejazzoid

    bluejazzoid Strats Amore Strat-Talk Supporter

    Messages:
    5,289
    Joined:
    Aug 14, 2009
    Location:
    Southeast USA
    You got me there! However, the shiny gold now showing where the original OT sat makes me still think it was changed out at some point... but maybe by a Canadian!!! :p
     
  16. Robins

    Robins Dr. von Loudster Strat-Talk Supporter

    Messages:
    11,911
    Joined:
    Dec 22, 2010
    Location:
    Germany
    Canadian amps came with normal switches not the rockers switches but mostly with green LCR caps like yours.
    Hmmmm... maybe one missing link in the history of Marshalls.
    I have seen some oddballs coming from Marshall through the years.

    All the best,
    Robin
     
  17. Trojanhead

    Trojanhead Strat-Talk Member

    Messages:
    83
    Joined:
    Jun 30, 2014
    Location:
    Indiana
    I can see where the original was mounted , and it just looks new , not consistent with the patina of other components
    I’ve been using tung-sol power tubes in my other amps with great success
     
  18. Williamwolka

    Williamwolka Strat-Talker

    Age:
    37
    Messages:
    251
    Joined:
    Dec 10, 2017
    Location:
    Indiana
    Here are pics of mine if that helps. image.jpg image.jpg
     
    Robins likes this.
  19. Robins

    Robins Dr. von Loudster Strat-Talk Supporter

    Messages:
    11,911
    Joined:
    Dec 22, 2010
    Location:
    Germany
    Yes, that is the typical Drake transformer Marshall used.
    But they also used the Dagnall transformers during that times (if they had them laying around).
    I think at this point it would be logical to think the output transformer was added later but Marshall did some strange things back in those days (and throughout the entire history of Marshall amps).
    I am curious but it sounds great so it doesn´t matter which one is in there afterall.

    Life is good,
    Robin
     
    Williamwolka likes this.
  20. Stevem

    Stevem Senior Stratmaster

    Messages:
    1,089
    Joined:
    Sep 3, 2014
    Location:
    NY
    What I mean is these days 99% of the replacement OTs have the Marshall recipe down dam well and you would be challenged to hear a difference!
     
    Robins likes this.
  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.