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Mesa 2:90 power amp is humming loudly

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  • Mesa 2:90 power amp is humming loudly

    Hey everyone. So my Mesa 2:90 power amp is humming. First, lemme give you a run down on my set up. It's simple...I run my guitar into a Rocktron Chameleon 2000 and that runs into the Mesa. Done. When I flip the standby switch to ON on the Mesa, it hums and as I turn the volume knob up of course it gets louder. What I've been doing to compensate is turn the volume down on the Mesa to reduce hum and crank the volume on the Rocktron, which helps, but still...I'd rather pump the volume a little bit more on the Mesa. I had the amp serviced in March...tubes (power tubes, not preamp tubes) changed along with some circuitry (something burned in there! so I figured it was time for a fix). It was fine after the fix...but now the hum is slowly but surely becoming more present with each use. I'm in a band and am recording very soon so this will become an issue. have you guys had this problem before? Is it a simple fix? I've checked the cables...it's not them. The power tubes were already replaced. Oh another piece of info is there are only tubes in Channel A and I only use that channel. Channel B isn't being used (volume is all the way down since you can physically turn it off). The techs said that was fine.

    So....any suggestions???
    LIVE TO ROCK, ROCK TO LIVE

  • #2
    Bad phase inverter tube, change all 3 12AX7's in there.

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    • #3
      Sounds tube related
      Mesa/Boogie Mob

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      • #4
        I could be mistaken, but I believe this sounds like a tube related issue...
        Current Rig:
        Mark IVA Rackmount
        GMajor 2
        FCB1010
        2x12 GFlex - Emi Swamp Thangs
        2x12 GFlex - G12H-100s
        Ibanez S 2170 SE - EMG 85/81 18V mod
        Ibanez S 520 WNF - EMG 85/81

        Stable:
        Mark IVB Combo
        Peavey 5150 (block letter)
        Crate V3112
        4x12 Avatar Trad

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        • #5
          Yea I figured it was a tube problem...but you said its the 12Ax7's? Do those create a humming? I thought they created more of a hissing...I'm not sure though. I don't think it'd be the power tubes because those were changed only 6 months ago...
          LIVE TO ROCK, ROCK TO LIVE

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          • #6
            just a stab in the dark but you might want to swap out your preamp tubes
            FRYETTE DEATH SQUAD
            Mesa/Boogie Mob m/m/
            Intern of Teh







            Originally Posted by abecon5


            what kind of toan will i get if i replace my maps tranny with a she-male???









            Originally Posted by Sheik_Yerbouti


            It is a scientific fact that it is impossible to look uncool rippin' on a Sexplorer!









            Originally Posted by ATauO


            ah shiz.. here comes the asstroglide ampclowns









            Originally Posted by Sixtonoize


            I don' know who this Solandow guy is, but I think he's full of ****************.

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            • #7
              Yea I figured it was a tube problem...but you said its the 12Ax7's? Do those create a humming? I thought they created more of a hissing...I'm not sure though. I don't think it'd be the power tubes because those were changed only 6 months ago...


              12AX7's can cause hum also. Also, tubes can go bad at any random time, so it doesnt really matter how new they are. I've had some die in like a week, so you just never know.

              The only circuit related thing that normally causes a lot of hum is bad filter caps. But, I dont think those units are old enough to have that problem.
              Mesa Triple Recto
              Marshall 2203 Clone
              Axe-FX/POD HD500

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              • #8
                Ok thanks guys. That helps a lot. What's the best website for tubes? I usually use tube depot, but any suggestions?
                LIVE TO ROCK, ROCK TO LIVE

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                • #9
                  PhatGirl on here sells tubes and she is very helpful

                  I think her website is the Valve queen or something..

                  it is http://www.valvequeen.com/
                  http://www.guitarampboard.com we have gone there, please follow!!!Rememberhttp://www.guitarampboard.comYes that's righthttp://www.guitarampboard.com^_^ http://www.guitarampboard.com ^_^

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                  • #10
                    i'd suspect that the power tubes have drifted. if one tube is drawing a significantly different amount of current, the amp will hum.
                    got a question about TITAN amps? ask me
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                    • #11
                      Usually the humming is because the amp forgot the words.

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                      • #12
                        Usually the humming is because the amp forgot the words.
                        Isn't there a freeway close by you should be playing on?

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                        • #13
                          Cool. I'm glad that I can fix this without much of a headache. I'll probably just change all the tubes...but maybe i'll hit up the preamp ones first since they havent been changed since i got the amp in '07. haha.
                          LIVE TO ROCK, ROCK TO LIVE

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                          • #14
                            It might be the toobs.

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                            • #15
                              lulz
                              FRYETTE DEATH SQUAD
                              Mesa/Boogie Mob m/m/
                              Intern of Teh







                              Originally Posted by abecon5


                              what kind of toan will i get if i replace my maps tranny with a she-male???









                              Originally Posted by Sheik_Yerbouti


                              It is a scientific fact that it is impossible to look uncool rippin' on a Sexplorer!









                              Originally Posted by ATauO


                              ah shiz.. here comes the asstroglide ampclowns









                              Originally Posted by Sixtonoize


                              I don' know who this Solandow guy is, but I think he's full of ****************.

                              Comment













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