Triple rectifier no input or channel select.

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Dackenshire
Bottle Rocket
Posts: 2
Joined: Fri Jun 16, 2017 8:30 pm

Triple rectifier no input or channel select.

Post by Dackenshire » Fri Jun 16, 2017 8:46 pm

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?

3124+
Mark II
Posts: 124
Joined: Mon Feb 05, 2007 11:02 pm

Re: Triple rectifier no input or channel select.

Post by 3124+ » Sat Jun 17, 2017 1:36 am

These symptoms indicate a problem with the +3/-3VDC supply. Bad diode or something.

Dackenshire
Bottle Rocket
Posts: 2
Joined: Fri Jun 16, 2017 8:30 pm

Re: Triple rectifier no input or channel select.

Post by Dackenshire » Sat Jun 17, 2017 11:02 pm

Any idea how much a repair might be if it's one of these things?

3124+
Mark II
Posts: 124
Joined: Mon Feb 05, 2007 11:02 pm

Re: Triple rectifier no input or channel select.

Post by 3124+ » Sat Jun 17, 2017 11:48 pm

Probably not much $.

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