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Discussion Forum for Mesa Boogie Products
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PostPosted: Fri Jun 16, 2017 8:46 pm 
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Bottle Rocket

Joined: Fri Jun 16, 2017 8:30 pm
Posts: 2
I'm new to the forum. My rectifier has been having issues with noise. So I bought a few new replacement mesa 12ax7 tubes .. while I was switching them out I had the amp in standby and pulled a 12ax7 and realized I didn't turn the power off only the stand by. According to the mesa trouble shooting video removing them in standby should be ok. Well I flipped it back on but the channels don't light up any more and won't switch with either the foot switch or the knob on the back. What's more, it no longer has input sound. So no guitar sound, but you can still here it buzz away. And you can hear the volume of the buzz swell on the master vol, the 2nd channel volume, and the fx loop volume if you turn them. It almost seems like channel 2 is active with no lights and the amp is not receiving any input. I have tried all the original tube and different variations of tubes and nothing is bringing the channel selected or input sound back. I'm afraid I bricked it somehow by trying to replace the tubes. Has anyone had a problem with getting input sound and not being able to select channels with the amp or pedal?


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PostPosted: Sat Jun 17, 2017 1:36 am 
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Mark II

Joined: Mon Feb 05, 2007 11:02 pm
Posts: 122
These symptoms indicate a problem with the +3/-3VDC supply. Bad diode or something.


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PostPosted: Sat Jun 17, 2017 11:02 pm 
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Bottle Rocket

Joined: Fri Jun 16, 2017 8:30 pm
Posts: 2
Any idea how much a repair might be if it's one of these things?


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PostPosted: Sat Jun 17, 2017 11:48 pm 
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Mark II

Joined: Mon Feb 05, 2007 11:02 pm
Posts: 122
Probably not much $.


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