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So I got news ! I contacted Mesa Boogie via Facebook, and amazingly a guys answer to me. He told me to try my 220V Mark IV with a 2,5 slo boo, instead of 2. And it worked. So my problem is solved. Thats explains why the tech didn't find anything wrong with the amp. Cheers !

Hi Stokes. Thanks a lot for your answer. Yes it happens with the power switch, not the standby one. Once the amp is on, I have not problem at all. I'm sorry I'm a french guy and I don't unterstant what a "PT" is ? The Mark IV has no rectifier tube so the problem can't be this one. I take not...

Hi everyone. I own a european Mark IV combo, and I have fuse issues (220V) : The fuse blow sometimes when I start the amp, and more surprisingly, when I switch it off. I can't understand why and I find nothing on the web. The amp is in the hand of my tech, who didn't figure it out by now. All...