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I recently purchased a 1990 Mark IVa. It sounds super, but has some minor cosmetic issues. I was wondering if anyone here having a Mark IVa from 1990 could post some pictures or PM so I can respond with my E-mail address for pictures? The amp is in a standard, black tolex covered cabinet...

I'm with everyone else here, though I'm new... I have a JP6 BFR (Bahama Blue Burst quilt) and it's absolutely awesome through EVERYTHING that I've played it through--currently a Mark IVa. You can quickly tell what pickup configuration you have--the D-Sonic is in the bridge and has a bar on...

I decided to spring for the switch...new from Mesa. Scott

Thanks for welcoming me! The eBay suggestion is a good one, however they're not listed as frequently as other items. I suppose I could replace the IC's on the large board and hope that only the switching circuit was damaged (I have no way to test IC's)--that may be the least expensive way to...

Hi everyone, First post and a new Mark IV user. Yesterday, I picked up a used 1990 Mark IVa (at a very reasonable price) and from my first impression, it's awesome. Such flexibility and such killer tone! I'm super impressed. Only one problem, though: The footswitch was broken when I got...