I used to use them with a Primaluna Prologue Four, it sounded great but I started messing around again with solid-state gear and ended up with a Bryston preamp which leads me to the 3B-ST and now I'm all in on Bryston!
IF another comparable 3B-ST shows up I'll get it to run both in bridged...if one is not in the cards I'll eventually upgrade to a newer, more powerful one in the SST2 or cubed lineup.