Tired Marshall 2061x

Discussion in 'Marshall Amps' started by RRongman, Feb 17, 2020.

  1. RRongman

    RRongman New Member

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    Hi



    I’ve got a JMP 2061x manufactured in 2004. I bought it last year (2019) and it contained the original tubes (It said Marshall on them). It sounded fine but since I play a lot I’ve now changed all tubes (JJ´s) and it came back to life again.

    But now recently it feels thin in sound, the volume goes up and down randomly. After about one hour of playing it settles. When powering up, it also generates quite some noise, more than before. Even without anything plugged in. I can send a sound file from a power up so you can hear the noise it generates. I couln´t find a way to attach it here.

    So is there anyone out there who please can point me in a direction what to do?

    Since the tubes are new I think it must be something else that is in need to be replaced.


    Thanks in advance!

    IMG_0052.jpg IMG_0237_fxd.jpg
     
  2. pedecamp

    pedecamp Well-Known Member

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    Thats a very nice looking amp brother, you may have a new tube that is bad it happens. So what was wrong with the old tubes you took out of it, I dont believe you said. For a start I would clean all tube sockets, inputs and pots with Deoxit electronic cleaner, the amp is pretty old and could use it. Then take a known good preamp tube and swap it into each position one at a time to see which new tube is bad. If no luck try the same with the power tubes. Let us know how you make out. :yesway:
     
  3. dju

    dju Member

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    do you still have the original tubes? you could put them back in temporarily to see if the thin sound and noise goes away. this is assuming the original tubes didn't do this. even new tubes can go bad unfortunately.
    also maybe try using some deoxit cleaning spray on the sockets if you have any.
    good luck,
    dj

    EDIT: sorry for saying basically the same thing as pedelcamp. he must have pressed the post reply button while I was typing my reply as his reply wasn't there when I started.
     
  4. Mitchell Pearrow

    Mitchell Pearrow Well-Known Member

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    Both of you said the same thing I was going to say, about tubes and dirty sockets, I have no hands on experience with this amp so I cannot add to the trouble shooting process, Ofer than if it’s not a tube issue? Does it have an FX loop, try jumping it with a patch cable and clean it as well.
    Hope you get back up and running healthy.
    Cheers
     
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  5. hpharley90

    hpharley90 Member

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    did you bias tubes? you did not say.

    edit: I don't see a bias pot.
     
  6. netlocal

    netlocal Well-Known Member

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    Had a 2061x. With the 2061cx cabinet. Glorious sound. Only amp I ever had that I actually saw smoke come out of it when it blew up. :hbang:
     
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  7. RRongman

    RRongman New Member

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    Thank you all for your replies!

    I will use some Deoxit to see If this will remedy the issues. Also have a go swapping the old tubes back in and compare as to pedecamp´s and dju´s suggestion.

    @ Mr Pearrow no it not contain a FX loop.

    @ hpharley90 To my understanding this amp/model is self biased?

    I will get back after I´ve done the cleaning and swapping with tubes.

    Cheers
     
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  8. steveb63

    steveb63 Well-Known Member

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    Just ime
    My 2061 goes through power tubes, gets played only rarely as of late, but it's always eaten those el84's.

    Course I run it full out lol.
     
  9. Chris-in-LA

    Chris-in-LA Well-Known Member

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    EL84’s are not as durable as EL34’s. @RRongman might just need to keep a supply of fresh ones on hand.
     
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  10. RRongman

    RRongman New Member

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    Hi

    Have now cleaned the tube sockets, swapped out and tested the tubes.
    And it was in fact the new EL34´s that generated the crackling sound.

    Will follow @steveb63 recommendation to have fresh EL84 spares on the shelf.


    Thank you all for your help!
     
  11. RRongman

    RRongman New Member

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    I meant of course the new EL84`s….
     
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  12. purpleplexi

    purpleplexi Well-Known Member

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    Ought to sound pretty darned good. They do....
     
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  13. gadgetfreak

    gadgetfreak Active Member

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    Glad you found out your issue, I was going to say you can tap on the tubes when amp is crackling and 9/10 find dodgy tube real quick. It will ting and make plunky sounds and even may get really staticky. GL and JJ el84s are great. I have a 1974x head clone that I run hot and they last the best
     
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  14. pedecamp

    pedecamp Well-Known Member

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    Good deal! :yesway:
     

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