Musical Fidelity A1. Class A solid state. 35wpc claimed. I have the 2008 version; it is an integrated but I will often use it in HT mode to bypass as much of the integrated preamp circuitry as possible.
Having said that, I run it with any of 5 different sets of speakers, the best for detail being my Reference3A DeCapo I speakers.
Synergy is an important factor in speaker/amp combinations of course.
Runs too hot for the summers here in Sin City though. I tried placing wet rags on the top of the chassis which is also the heat sink, but it was too much trouble to keep the cloth sufficiently damp without dripping water into the electronics :)
Sublime sound though!