You'd have to give more info.
What does it do or not do?
Adcom's have a great reputation, however, the one you have is not one of their premium models. At 80W into 8 ohms and 125 into 4, it is at or below many mid-level AVR's.
So for sale, you have name-brand working for you, but mediocrity of performance working against you.
You can check pricing on ebay for a rough value (if it worked).