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That was one of the first things I tried - didn't make a difference.

When I picked it up he asked about it being covered and he was kind of surprised and didn't know it was warranty work. I called Mesa before I took it in and they said he would look up the S/N, so I thought I didn't need to do anything, but maybe I needed to state it up front. I don't think the...

Well, I just got my amp back from the tech. He went through and tested everything and cleaned all the pots and said it sounded fine to him. So, I had him plug it in at the shop and it did sound good. I still want to test it at home and see if I notice it anymore. He said sometimes just...

You definitely need matched power tubes. You can probably get by with matched pairs for the two inner and two outer power tubes, but as you noted there is no bias, so you should probably stick with the mesa tubes. I can't say if that is causing all of the problems you are noticing, but the...

Hi, I've searched this forum and elsewhere and can't find anyone that has a similar issue. I also called Mesa support and the guy seemed very knowledgeable, but said he had never heard of anything like it. So, I'd like to describe what I'm hearing and see if anyone else has experienced this on...