Members LIVEtoROCK86 Posted September 23, 2010 Members Share Posted September 23, 2010 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??? Link to comment Share on other sites More sharing options...
Members dmtnt Posted September 23, 2010 Members Share Posted September 23, 2010 Bad phase inverter tube, change all 3 12AX7's in there. Link to comment Share on other sites More sharing options...
Members JerEvil Posted September 23, 2010 Members Share Posted September 23, 2010 Sounds tube related Link to comment Share on other sites More sharing options...
Members Bob Vila Posted September 23, 2010 Members Share Posted September 23, 2010 I could be mistaken, but I believe this sounds like a tube related issue... Link to comment Share on other sites More sharing options...
Members LIVEtoROCK86 Posted September 23, 2010 Author Members Share Posted September 23, 2010 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... Link to comment Share on other sites More sharing options...
Members mcr23 Posted September 23, 2010 Members Share Posted September 23, 2010 just a stab in the dark but you might want to swap out your preamp tubes Link to comment Share on other sites More sharing options...
Members Shask Posted September 23, 2010 Members Share Posted September 23, 2010 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. Link to comment Share on other sites More sharing options...
Members LIVEtoROCK86 Posted September 23, 2010 Author Members Share Posted September 23, 2010 Ok thanks guys. That helps a lot. What's the best website for tubes? I usually use tube depot, but any suggestions? Link to comment Share on other sites More sharing options...
Members Neilrocks25 Posted September 23, 2010 Members Share Posted September 23, 2010 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/ Link to comment Share on other sites More sharing options...
Members knucklefux Posted September 23, 2010 Members Share Posted September 23, 2010 i'd suspect that the power tubes have drifted. if one tube is drawing a significantly different amount of current, the amp will hum. Link to comment Share on other sites More sharing options...
Members Fission Hole Posted September 24, 2010 Members Share Posted September 24, 2010 Usually the humming is because the amp forgot the words. Link to comment Share on other sites More sharing options...
Members pezguy Posted September 24, 2010 Members Share Posted September 24, 2010 Usually the humming is because the amp forgot the words. Isn't there a freeway close by you should be playing on? Link to comment Share on other sites More sharing options...
Members LIVEtoROCK86 Posted September 24, 2010 Author Members Share Posted September 24, 2010 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. Link to comment Share on other sites More sharing options...
Members DEADBYDAWN Posted September 24, 2010 Members Share Posted September 24, 2010 It might be the toobs. Link to comment Share on other sites More sharing options...
Members mcr23 Posted September 24, 2010 Members Share Posted September 24, 2010 lulz Link to comment Share on other sites More sharing options...
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