Update on my tone report. I have been playing my Modern Eagle Quatro with 53-10's. and 10 ga. strings. I found the sweet spot on the amp was within to narrow of a window for my liking. The saturated, compressed, blooming notes could easily find themselves in overdrive territory to easily. So I set the amp with a little more gain and drive that was slightly out of the sweet spot and left the amp alone. I swapped out a 10 foot cable for a 25 foot cable and found a slight reduction in the overdrive. I tried this because I had seen and read and about it but did not really think much of it, but it is true. Not a lot of difference, just a little. Next thing I did was start lowering the bass and treble pups 1/4 and/or 1/2 turn at a time. Each turn brought better and better results. With the bass pup flat even with the ring and the treble pup slightly half of its factory spec height, I was just about there. The overdrive went away and those creamy blooming notes were in full wonderful force. The sustain had improved also, but not enough to my liking. I swapped the strings for PRS 9.5's and I can proudly say I have found my sonic nirvana. Ten,twelve, fifteeen seconds of clean sustain with no effort. Oh Mercy! The sustain increased significantly and the amp kept that sweet saturation point without being overdriven. Adjusting the volume on the guitar just made it that much better with only very little being added as overdrive. Back at the amp I found more wiggle room to expand the sweet spot.
What a splendid combination, PRS ME Quatro, 53-10's, Mesa KingSnake (Mark 1) . Mercy! This amp brings the best of the Mark 1 and Mark2C+ together, I do believe. The tone I am getting just takes me to another place. I feel as if the guitar is part of me and the amp is pulling the notes right out of my head with the guitar as the conduit. Whew! I need a cigarette and I do not even smoke.
Oh, and yes Boogie, a HBII is in the works and I could not think of a better amp to run it through.