Marshall Jcm 800 4211 Model

Discussion in 'Marshall Amps' started by Crikey, Mar 14, 2019 at 8:50 PM.

  1. Crikey

    Crikey Member

    Joined:
    Feb 16, 2019
    Messages:
    57
    Likes Received:
    89
    UPDATE, i bought the amp for 500$.tech help needed.
    Its got an issue either in output or preamp tubes. On the boost channel there is very little volume. On the clean channel its loud but not as loud as a 100 watt should sound. How do i diagnose if its tubes or other issue like transformer? All tubes are glowing but drive channel is a whisper. Clean channel seems as if its on volume 3 , volumes are all the way up, when compared to my 900.

    gents, sonically is the 4211 jcm 800 similar tonally with the 2203? I know it sounds like a very dumb question but see one for $850. Thoughts on this model which appears to be a 2x12 combo 100 watt.
    Anyone own or play this model before? I would prefer the 2203 but if its the same guts as a 2203 it seems like a sweet deal
    Anyone? Bueller?
     
    Last edited: Mar 15, 2019 at 4:48 PM
    Mitchell Pearrow likes this.
  2. Gutch220

    Gutch220 Active Member

    Joined:
    Feb 19, 2018
    Messages:
    359
    Likes Received:
    182
    Location:
    NJ
    that is one of the split-channel JCM800's as opposed to the single channel 2203. So there will be a difference, but for $850, that's a good price and you should buy it.
     
    Crikey and Mitchell Pearrow like this.
  3. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

    Joined:
    Jul 2, 2018
    Messages:
    4,580
    Likes Received:
    5,137
    Location:
    Moreno Valley CA
    Jump Crikey that would be a fine stable mate, and 850$ is a damm good price! Cheers Mitch
     
    Crikey likes this.
  4. Gutch220

    Gutch220 Active Member

    Joined:
    Feb 19, 2018
    Messages:
    359
    Likes Received:
    182
    Location:
    NJ
    Well you're right to start with the tubes. I'd swap out the tubes anyway if I bought another person's amp.
     
    Mitchell Pearrow and Crikey like this.
  5. Crikey

    Crikey Member

    Joined:
    Feb 16, 2019
    Messages:
    57
    Likes Received:
    89
    I plan to pull out the chassis clean the pots and check for bad solder. Looking at an old thread for same amp some suggested it could be several things, bad pots, bad tubes, cracked solder on pc board. Will try those first
     
    Mitchell Pearrow likes this.
  6. Georgiatec

    Georgiatec Well-Known Member VIP Member

    Joined:
    Apr 23, 2010
    Messages:
    5,029
    Likes Received:
    3,653
    Location:
    Macclesfield, UK.
    Another boost channel dual concentric pot bites the dust. :rolleyes:
     
    Crikey likes this.
  7. Crikey

    Crikey Member

    Joined:
    Feb 16, 2019
    Messages:
    57
    Likes Received:
    89
    Good news. I pulled the chassis out and saw where the footswitch input was loose and installed it correctly. Turned on power with chassis out and pulled guitar in and Lord Sweet Jesus she ROARs!! Put chassis back in and sounds good but think it needs to have tubes biased.
     
    Georgiatec and Mitchell Pearrow like this.
  8. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

    Joined:
    Jul 2, 2018
    Messages:
    4,580
    Likes Received:
    5,137
    Location:
    Moreno Valley CA
    Excellent brother, I am glad you got it and got it going :cheers:
     
    Crikey likes this.
  9. Georgiatec

    Georgiatec Well-Known Member VIP Member

    Joined:
    Apr 23, 2010
    Messages:
    5,029
    Likes Received:
    3,653
    Location:
    Macclesfield, UK.
    An easy fix, happy days mate. :fingersx:
     
    Crikey likes this.

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