Unison Research S2K KT88 based integrated. In excellent condition with original box, manual, and original tubes that have a total of about 100 hrs on the tubes (max - may not even be broken in). Bought new old stock in late November 2011. I should rate this a 10/10, but will be over conservative. Wired for 120V, 60Hz operation (typical US voltage).
15 watts/ch of single ended class A bliss. Four inputs and a tape loop. Remote sensor integrated into the unit - the IR remote can still be purchased from any Unison dealer if you want remote volume control, but I did not purchase the remote. This is one of the later serial numbers. Excellent sounding, wonderful amp that will drive moderate loads with ease.
Long story short, I bought this S2K new old stock near in late November 2011. Since then, I have done a complete system reconfiguration and moved away from high efficiency speakers. In the interim, I was remodeling my audio room, and I travel a lot for work, so this amp has barely been used. I had swapped in some new old stock input tubes and different KT88 shortly after buying the amp, so the original tubes (included) have barely been used - and as mentioned above, might have 100 hrs max. The amp itself has a max of probably 300 hrs on it.
My new speakers are not efficient enough for this amp, and I am sorry to see it go, but I would rather see someone else enjoying it rather than having it sit on a shelf.
Buy from a long standing audiogon member with confidence. Local auditions and pickup welcome.
Feel free to ask questions. Thanks for looking!