New to the site, long-time boogie player. Current main amp is a Mark III red stripe combo. I also have two .50 caliber (EL84-based) heads. One is the long chasis version and the other is the short chasis version in a rack mount frame. The .50 cals were my main amps back in my 80s metal days and they haven't seen much playing time over the last decade. (My days of lugging 4x12 cabs around are long over!). Anyway, plugged the rackmount one in the other day for the first time in years...........OMG! I cannot believe how ferocious sounding the lead channel is on that thing. Dare I say, it surpasses my Mark III's lead tone. I might have to convert that one into a combo!