I bought one, along with Senn 800's and changed the tubes for
Genalex/Gold Lion ECC83's.
I found the new Senn's sounding better and better as they were getting broken in but the amp, especially with the added bass button ON, sounded beutiful.
Rich, warm, nothing 'tinny' and could play some mean R & Roll!
I've had the unit for 6 months now and I recommend it whole-heartedly.
Munchoba
Associated equipment:
QNAP server,Atoll DAC,Cardas interconnects, Mac Mini 201,Classé Preamp.
All AIFF sources.