I was given a Denon PMA-320 Amp by my father who I believe has had it a fair few years until I convinced him to upgrade to a modern surround-sound receiver... However, I don't know anything about it. How old is it? and how much did it cost when new? Where would it come in the Denon range of products at that time (Ie, would it be a top-end model, or a lower-end model?) Until recently I have been using it on my PC, along with an old set of Celestion speakers for playing games Etc... I intend to upgrade to a decent surround-sound receiver in the next few months, so thought I could possibly sell the Denon to help raise a bit of cash to pay for the new system... But need to know a bit about it before I do so.