I just can't seem to get a O.D tone out the stock Mesa C-90 that I like. I unplug the speaker and plug into my EV loaded Thiele and Woah!!! super tone. I been thinking about building/finding a headshell for the amp and ditch the combo format. I just don't care for the mid honk I can't dial out without losing the beefiness of the amp. I've thought about just selling the amp but I know there is good stuff in there. The amp has just gotten back from the shop with a complete freshen up (Caps, out of range resistors).. It has Winged "C" 6l6s.