Check out my System.
I am running either a Tact or a Rowland Synergy IIi preamp running on batteries. The Lamms are Straight Class A biased and they do run very hot just like a big tube amp, but they are magical amps! (They were much better than both the Rowland 501's and the Rowland 201's that I tried at home, plus they were also leaps and bounds better than my ARC D400 MkII) The only thing close that I have heard is the VTL S400 and that amp just added a 2% more air on the top. My M1.1s are a special edition version however.