There has have been alot of Marshalls in this area in the past 35 years of my life on earth as a musician,but one sticks out-----it was an old plexi 50 (of course,this was before we had all those identifiable jargon terms like "plexi") with an 8-10 cab.This thing was absolutely rude,and if you plugged anything with P-90s into it,you might get nuked. I think that the Marshalls of this era (68-73) rule as far as rock.......as far as P-90s through a plexi,anyone remember "You Are The Music,We're Just The Band" by Trapeze? SG Special through stacks.......too much.