I just bought my second Mark IV three years after I sold my first. I found how to set this thing up after having just about every other MESA product come through my hands! It compliments my other Boogie amps and has it's own thing going on. Plus it is beautiful Bubinga and wicker.
https://www.flickr.com/photos/100168049 ... ed-public/Aggressive metal settings. 6L6/EL34 Full power, simul-class, mid gain, pentode. EV speaker in the combo, C90 in the thiele. Crucial settings - R2 gain 10, LD 10 pull fat, LG 7, CH. masters - 8. Good head ripping tone.