Why Does My 2555x Sound Muddy?

Discussion in 'Marshall Amps' started by SilentNovocain, Jul 25, 2018.

  1. SilentNovocain

    SilentNovocain New Member

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    I've had the 100 watt silver jubilee head for about 2 years now and it's never been gigged but over the last couple months I've noticed it sounding darker and muddier even with all of the bass rolled out. The tubes all *look* fine.
    Any ideas why? Seems like when I got this amp it was super treble-y and would cut through a mix no problem
     
  2. Kutt

    Kutt Well-Known Member Gold Supporting Member

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    Same speakers / cabinet(s) the entire time? Or are you changing those up?

    Have you been using the amp regularly? If so, it's not unreasonable for your tubes to start wearing down during a 2 year period and sound poor, especially the power tubes. My money is on your tubes being the culprit.
     
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  3. SilentNovocain

    SilentNovocain New Member

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    I've tried through both my JCM800 Lead 4x12 and an 80s Randal 412TC cab. Sounds about the same. Honestly the tubes were my first guess, I've never held on to a head long enough to hear the tubes go from good to bad
     
  4. charveldan

    charveldan Well-Known Member

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    Swap some preamp tubes.
     
  5. mickeydg5

    mickeydg5 Well-Known Member

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    Something else to look into; always check and clean your jacks and cable plugs - guitar jack, amplifier jacks, speaker cabinet jacks, instrument cable, patch cable, speaker cable.
    If those tarnish or dirty it will degrade the signal path.
    Always check any cables for good continuity as in near zero ohms from one end to the other and no continuity between positive and negative contact points.
     
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  6. marshallmellowed

    marshallmellowed Well-Known Member

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    You could be experiencing high frequency hearing loss (not joking).
     
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  7. SilentNovocain

    SilentNovocain New Member

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    I thought about that but I don't have any issues with my DSL15H, And I've played multiple guitars through with various pickups and it does the same thing.
     
  8. BanditPanda

    BanditPanda Well-Known Member

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  9. Matt_Krush

    Matt_Krush Well-Known Member

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    or, you no longer care for the amp.
    I tried to like mine...it sounds great for what it is, but it isn't my tone.

    sold it and don't miss it.
     
  10. mickeydg5

    mickeydg5 Well-Known Member

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    Somehow I do not think that is his issue.

    By the way what amplifier do you like?
     
  11. mickeydg5

    mickeydg5 Well-Known Member

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    Well then as others have mentioned, the next thing to check is preamp tubes and power tubes along with bias.
     
  12. CyrusTheFabulous

    CyrusTheFabulous Member

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    New tubes. I'm digging The Tube Store 7025 preferred series a lot. Haven't settled on power tubes yet.
     
  13. mickeydg5

    mickeydg5 Well-Known Member

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    But is not that GandalftheWhite?
     
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  14. mickeydg5

    mickeydg5 Well-Known Member

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    Clean your tube pins and tube sockets with a good electronics lubricating cleaner while at it as well.
     
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  15. Matt_Krush

    Matt_Krush Well-Known Member

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    If the question was directed to me, I like the modern sounding amps. I play primarily speed metal/thrash.
    My current heads I use are the JVM 205 and 410 (both modded with choke and negative feedback controls...and tube changes).

    But I owned and really liked the B52 AT100, had it for 13 years...I only sold it because I like the MIDI capability of the JVM series (I use a G-Major with it). The G Major switched the B52 head channels fine...I just found myself not playing the thing and decided I didn't need to stock 6l6's as well as El34 type tubes.
    I'll also admit that after about 5-6 years of playing the same RIG, I get bored and want a change up (like a guitars).
    **Damn...2-3 years from now I might be switching up again...

    Haven't tried the Mesa Triple crown (I'm afraid I'd want it if I did). Never cared for the Rectifier series and never played any other Mesa models (no one here has them or any boutique branded stuff).

    I like heads that I don't need pedals to achieve my desired distortion. The G-Major is only for lead effects, noise gate and slight EQ work.
    I really play with a dry signal for everything but leads....maybe a touch of the JVM reverb...but very little when I do.

    I don't mind getting an amp that is really close to what I want and modding them. It's a way I can create' my tone' that no one else can have.
    The Jube was cool, not my tone and not versatile enough without having more outboard gear than I wanted ( like simple, less to connect, less to fail).
    I tried...really I did.
    That was an amp I wouldn't bastardize with mods...
    I did the proper thing. Sold it to someone who really appreciated it and made all but $80 of my paid for price back.
     
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  16. ampmadscientist

    ampmadscientist Well-Known Member

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    Probably the bias gone cold- if the bias pot wiper fails, the bias voltage goes to max.
    This will make the amp sound like mud.
    I suspect the bias is way colder than it should be. (from what you describe)

    Operate the amp for 15-20 minutes then feel the power tubes, do the tubes get plenty hot or do they stay only warm?
    The tubes "should" be getting pretty hot. Almost too hot to touch.
    If the tubes are only luke-warm, that's probably it.

    Then, a preamp tube could have gone sour.
    Change the preamp tubes one at a time w/ a new one. Re-test each time.
    If you have a stale preamp tube, you will find it that way.

    (you do not need to buy a whole set of tubes, just one new 12AX7)

    Plug a guitar cable between effects send and return, then re-test the amp.
     
  17. Kinkless Tetrode

    Kinkless Tetrode Well-Known Member

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    It's really easy to just measure the bias on that amp.
     
  18. CyrusTheFabulous

    CyrusTheFabulous Member

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    I go by many names...had to choose one.................
     
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  19. mickeydg5

    mickeydg5 Well-Known Member

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    I hate to break this to you but Miley and Gandalf are two very different creatures. :) I hope that is not you. :D


    upload_2018-7-27_0-34-11.png
     
  20. CyrusTheFabulous

    CyrusTheFabulous Member

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    Kids these days....
     
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