Audio Research SP16. I acquired this amplifier from a friends estate. It has been tested and works flawlessly. Cosmetically it is in like new condition except for a small area on the top, aft right corner where it looks like there was a sticker or something on it. If you look closely at the photos you can barely see the outline of what ever was on it . I have only been a member of audiogon for a short time but have 100% feedback. If you would like more feedback please see my eBay feedback where I have been a member since 2001 and have over 400 exchanges with absolutely no negative feedback. To see my feedback click on advance located at the top of most eBay pages. On the left side of the page click the "by seller" link. Enter "jake7595" and hit search. Thanks for looking.