Original owner. No visible marks found. Performs flawlessly. Used for PMC speakers, which I recently replaced with B&W 800 Diamond speakers and thus I changed to Classe brand amplifier. Child-free, pet-free, no smoking home. Placed into a custom theater installation professionally, then removed professionally and reboxed (original boxes) ... and now ready for a new home. 3 years old. Was rack mounted so I can't say "9/10" but looks great to me.
The Bryston 14B SST2 is a 600 wpc (into 8 ohms) Class AB solid state amplifier, push-pull, and fully differential (balanced). It has separate power supply transformers for each channel, and 30,000 μF of capacitance for each channel as well, making the amplifier essentially a dual mono design.
It has true balanced XLR as well as unbalanced RCA inputs, and a selectable sensitivity switch for use with preamplifiers that have more or less output (gives you more range in the volume control).