My pair of the venerable Audio Research 140w/ch (or so) Monoblocks.
Using 8- 6550 valves per monoblock, running in Triode mode, weighing 110 lbs each [!!!]. This amp is the absolute shit! I wish I had 3 more sets to drive my horns... Maybe one day. Tho, then I wouldn't need the Vintage gear, so...
(one amp is currently burnt from a lightning strike on the house; amps were off but one still got killed)