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I've already called twice and got tech support voice mail. Some tech named Chris something. So I left a detailed message so hopefully he will call back soon. I'm also trying to get a hold of customer service to find out if the amp is still under warranty, but I get voice mail as well. Also, the...

shredding: eq was setup correctly so that is not the problem. rabies: I will be calling a Mesa tech here in the next 30 min or so. I will post an update.

I stand corrected. Maybe it could be the power transformer. Let you guys know what Mesa says tomorrow.

I guess the output transformer is a high possibility since it does provide the high voltage to the power tubes. That would suck but I am praying this thing is covered under warranty. I don't know anything about transferable warranties but I hope Mesa has a record on this amp on file.

Jam7272: Tried what you suggested and it didn't resolve my issue. I really think my power amp is only half way working. I was touching tubes B,C,D and they are just warm. Tube A is the only one hot in Class A mode. When switching to Simul-Class mode A and B both get really hot while C and D are...

jman7272 thanks for your response! I will try that here after the Cowboys game as post my findings. rabies: I don't think it is the tubes. The amp is a 2006 or 2007 model, which should still be under the 5 year warranty. I swapped out all the tubes with tubes from my Peavey 6505+ and it acted...

I tried playing with lead gain on 10 and lead drive on 10 and my chords ring out clean, like clean channel clean. It only starts getting dirty if I pull the fat switch. Completely no balls, no even very small ones on lead channel.

Hi, this is my very first post and unfortunately its because I am having a problem with my Mark IV. I bought a 2006 or 2007 wide body combo on ebay and just got it yesterday. Amp appeared to be in mint condition. Last night I plugged directly in, put it in standby for a few minutes and powered...