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Noise on channel B of my 2:Ninety

Posted: Sat Apr 26, 2014 1:18 pm
by Gearbox
Hi, I am new to the forum and a boogie user for a few years now. I run a 50:50 power amp with my Axe Fx. A few weeks ago a got hold of a 2:Ninety simul class. Bought it from the first owner. It is from 1998 and a did put new tubes in from TAD. There was a crackling noise when I bought and I thought re-tubing would fix this. It did not. After checking everything it appears to be only on channel B. If the speaker cable is connected that is. And with the stand-by on, no noise when stand-by is off. I now use it as mono keeping the volume on channel B at minimum and no input connected. Sometimes the noise is gone for a moment and it comes back growing from almost nothing to very annoying.
A few questions
1. What could be the problem? I had contact with Mesa Boogie and they said it was most probably a bad resistor. Any other suggestions? I visually checked the circuit board and all is looking fine
2. Can I run the amp without the power tubes in channel B? The idea is not to have them running until I have the amp fixed.

Any help or idea is much appreciated!

PS I Have soundclip/video of the problem but can"t find a way to upload it... :?

Re: Noise on channel B of my 2:Ninety

Posted: Mon Apr 28, 2014 5:33 pm
by pegleg51
Hi..Had what sounded exactly the same problem un a nomad.Would have bet anything it was a resistor.It was a bad input jack.

Re: Noise on channel B of my 2:Ninety

Posted: Tue Apr 29, 2014 9:08 am
by Gearbox
Thanks for the feedback. I will check the input jacks and see if it is causing the problem.

Re: Noise on channel B of my 2:Ninety

Posted: Mon Nov 21, 2016 3:36 pm
by Corporal
Any luck on that ?