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Mesa Boogie Express 5:50 with buzzing problems...

Discussion in 'Amps and Cabs' started by psklaroff, Nov 1, 2009.

  1. psklaroff

    psklaroff Member

    Joined:
    Jul 29, 2008
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    Location:
    Neath Abbey, Wales, UK
    Hi All,

    I have a Mesa Boogie Express 5:50 2 x 12 combo which is still quite new and it recently has developed a rather annoying buzzing sound which I can't seem to get rid of. Initially I thought it might be my effects or a bad cable but after taking everything out of the effects chain and just plugging in the amp through a good cable I've found that the problem seems to be the amp.

    The problem is a very noticeable buzzing (which happens with all of my guitars) when the guitar is turned up and it disappears when I touch something metallic on the guitar or when I turn the volume off on the guitar. I don't know much about the electronics of tube amps, but could this be a valve (tube) issue of some sort?..the valves I use are fairly new and from Doug's Tubes, so I am assuming that they are OK....

    Any advice would be gratefully received....

    Thanks

    Pete
     
  2. les_paul

    les_paul Member

    Joined:
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    168
    The problem is more than likely with your power outlet. It sounds like the outlet is not grounded properly. I have never had the fortune of living in a house with properly grounded power, so I have the same problem with all of my amps.
     
  3. psklaroff

    psklaroff Member

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    Location:
    Neath Abbey, Wales, UK
    Thanks LP, that's really helpful.

    Is there a way around this at all?...as I didn't notice this when I first got my amp.

    Thanks

    Pete
     
  4. les_paul

    les_paul Member

    Joined:
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    You know, to be honest it just kind of pissed me off at first but I just learned to live with it. I haven't actively sought out a solution. The only one I can think of right off hand is calling up Mr. Electrician and seeing what he has to say. There may be some sort of pedal/rack piece that might do the trick.
     
  5. jett1963

    jett1963 Member

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    Monaco
    Is it buzzing or a little like a stack of plates rattling as a truck rumbles by. I has a similar problem and so have others. I actually returned my first 5:25 because of it. Interestingly, my second began to do the same thing particularly after topping out on the headroom (very bassy stuff).

    I found that if you take the tubes out and re-seat them the rattling stops. I probably have to re-seat about once per month.

    definitely not a buzzing sound though.
     
  6. psklaroff

    psklaroff Member

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    This is very much a buzz...and sounds like some sort of earth (ground) issue to my (uneducated) ears...definitely not a rattle type sound though.
     
  7. Waxhead

    Waxhead Member

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    It's hard to tell sometimes. I'd check the tubes (and the clamps that hold them) first to make sure they're seated firmly. If not it.....

    Use your mesa warranty - that's what it's for.
    There's been very few issues reported with the Express series on the Boogie Board. They've been exceptionally reliable amps since released
     
  8. psklaroff

    psklaroff Member

    Joined:
    Jul 29, 2008
    Messages:
    409
    Location:
    Neath Abbey, Wales, UK
    Thanks everybody...the valves seem fine and it looks as though the issue may be a ground (earth) problem although I'm not sure if much can be done about this.

    Any suggestions gratefully received though!

    Thanks

    Pete
     

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