yeah, Mesa make some amps with that feature, but not quite to the same extent...Their Stilletto Duece is reducable from 100 to 50 watts, and the trident from 150 to 50 (or maybe to 100?) but both amps will still be way too loud for home use at 50 watts...pretty sure they have a master volume though.

I think they also make a 50watt Lonestar that is reducible from 50 to 30 watts ( i think...not certain)