Amplifiers in use with big Harbeths (Mon 40 series) that work very well

i thought i would poll harbeth mon 40 owners on what amps they are using with them, and which amps you may have had excellent results with in the past, if you do not happen to have it today...

if you will, please also include, which specific gen of monitor 40 you have (.1, .2, anniv, .3, xd, what have you...), and your listening room and listening triangle dimensions, thanks.

owners only, current or past, please...