Just about the best sounding amplifier out there by Accuphase. Duo Mono in construction that most manufactures have moved away from due to cost. The fully balanced differential amp does make a difference and makes it a handful of amplifiers on the top.

Added bonus- beautiful anolg meters and can be used without a pre-amp but you are restricted only to two inputs- one XLR and the other SE- not a problem in today's digital word