Unison Research S2K KT88 based integrated running in class A, single ended pentode. 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. Amp probably only has a total of 300-400 hrs on it, most of which was on new old stock tubes (not included). I should rate this a 10/10, but will be over conservative.
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 need the remote, so no remote is included. 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.
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!