My friend uses the Lamm M2.2 monoblocks to drive his Rockport Antares speakers. These are actually 220 wpc hybrid amplifiers, but with only one tube in each amp, (a 6922 tube to be specific). Being a hybrid amp it combined the power of solid state with a touch of tube sound. These amps are some of the best amps we've heard with these speakers. Only the (150 wpc stereo tube) VAC Phi 300.1 amp was comparable out of the half dozen or so he auditioned.
Good luck in your search.
Good luck in your search.