RM100 with 4 KT88's. This one requires the side handles for carry. The transformers are huge. Supposed to be a Plexi/Superbass power section from what I've read. Matt at Motor City Mods has actually discovered this thing makes a great bass amp and made a bass module for it. He keeps telling me to run el34's, the amp has too much bottom, but I like it. I'll throw a pair in eventually. It's not very Marshally right now with this setup. Peavey Ultra 120 (old teal stripe). Not as loud as a 120w should be. My 5153 50w was louder. But you could feel the bottom end under your right hand better with the Ultra and it's the tightest amp I've still ever owned. B52 AT100 (Surprisingly good) Inherited that one, was in an old band members garage and didn't work. Got dropped and a capacitor leg popped out. Popped it back in the sleeve and glued it lol. Good power for modelers and great clean channel for pedal platform. 6505mh. Unfortunately looks like my power section is boned. Somehow the speaker defeat switch got bumped. Still works as a preamp, been using that way into the rm100 thru a loop switcher. When I get money I wanna have it fixed and converted into a rackmount head with a larger OT if possible and 6v6 instead of el84. Didn't really enjoy the thing on its own thru a cab at our practice volume. Big Iron is like the pulse in these amps. Goes from your right hand to the power section to the cab to the floor. You can make the smaller ones sound as good almost, but they sure don't feel as good.