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  1. D

    My Mark IV has a sqeeeeeeeeling problem

    Okay, the amp friggin rocked tonight!!! No squealing, no noise, just bad *** guitar tones. Played for two and a half hours I loved it. Then it just shut off. The 3A slow blow fuse went. Didn't have a spare so i put a 5 ampere in it just to check if it would come on. It did and i shut it right...
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    My Mark IV has a sqeeeeeeeeling problem

    Okay, I started looking through my old original Mesa Boogie 12ax7 tubes. I found a SPAX7 tube and remembered that it was originally in tube V1. Before swapping it i tried, once again, tapping the current tube in slot V1 and it made the sound. So i swapped it with the SPAX7. So far so good. I've...
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    My Def Leppard "rock of Ages" Cover / Performance

    Awesome vocal performance! Nice job. :D
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    My Mark IV has a sqeeeeeeeeling problem

    Yes, i have been reading this forum, and BTW it's an awesome forum, and previous posts led me to trying all new tubes. I haven't seen anyone sharing a similar problem either so i decided to join and ask the community. From what i've read, contacting Mesa seems to be a pretty good experience so...
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    My Mark IV has a sqeeeeeeeeling problem

    It starts after approx 5 minutes of being on. :shock: It sounds just like microphonic feedback. It was first noticed during a gig. I thought the soundman couldn't get an unruly microphone under control when our singer said. hey, it's your AMP!!!! And, it only squeels when the Lead or Lead-Eq...
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