Holy freakin' smokes. Rob, if you read this...I GOTTA send you an MP3 I recorded live of this amp being driven hard by a P-90 Les Paul. I had a chance to really crank this bad boy at the W.C. Handy Blues and Barbecue Festival in Henderson, KY over the weekend. Guitar plugged into the topboost channel (no OD pedals!), volume around 2:30/3PM, then jumpered over to the EF86 (normal EF86 setting) channel, volume at around 1PM. Master "w.f.o.". Hi and Lo, fairly flat...maybe a little extra Lo added, and Cut at 3PM or so. The sound was absolutely corpulent through a big PA. I've never had so many gearheads come up to me after a gig and go "What the hell kind of amp is that??"...and I've played some offbeat rigs in my day. Nice work, my friend!