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  1. I

    Mark IV rack mount head.....stopped working?

    Update: I checked the fuse and it was toast....Replaced it with a 4A slow burn, and then replaced all 4 of the 420's w/ 440's. PLugged it in and it fired right up. Sweet! Holy crap though! My head used to make so much **** extra noise....LOL I mean it used to just hum and hiss all...
  2. I

    Mark IV rack mount head.....stopped working?

    Thanks a bunch guys... I called Mesa and they helped me out....They told me the same thing you guys did. They said that if it doesnt work after a fuse and tubes, then it might need to be repaird.... I got 4 new 6L6's today, they are the 440's, and it had 420's in it. (Anyone know what kind of...
  3. I

    Mark IV rack mount head.....stopped working?

    Hey guys, Im new and searched a bit and couldnt find anything. I was recording last night, and the head started making a loud buzzing sound, then it lost about 1/2 its gain, and when i looked over in the corner, it was glowing red from behind the head. I went over and stuck my head behind the...
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