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Ok thanks for the feedback guys. I'll let you know when I get it figured out what it was.

Hey folks, I have a 1993 Mark IVA that I bought new and have played the crap out of. Recently two issues have cropped up: 1) It seems like I'm getting feedback from the fx loop return back into the send (wtf!). When I use a delay in the loop, I get a weird, choked sound like there's a phase...

Ok, please help me understand the weirdo setup on the Mark IVa. There are two sets of fx loop jacks, one set called "normal" and the other called "switchable". There is a rocker switch that lets you select Normal or Switchable. Testing shows that the normal and switchable jacks cannot be...

Hello, I'm rehousing my Mark IVa from the original combo into a Mesa headshell, finally. On the combo, which had sus-4 mounting, there were little metal claws that seemed to provide a grounding contact between the foil shielding of the combo and the metal of the head chassis. On the new...