As a condition of buying a CT-1010 tuner, the owner insisted that I take his AVX-700 with me. Free why not? I was going to sell it for almost nothing or give it away, but is appears to be mint first owner, and it sounds pretty darn good. It appears to be Yamaha's first effort into surround sound amps and has some interesting features for 2 channel listening. What Class amp is this thing? Sounds like Class A at low volumes and is fairly detailed and precise. Another unit I ran across, the owner was selling his system including the MX-630 and his TX-1000, I purchased the 630 and TX both no brainers. This also makes me think the original AVX units are Class A at low output? Nothing pops when I Google it.