My friend has the A-909 and the tuner to go with it. We are thinking about piecing this with some of our equipment so we could get a stereo system together. Does anyone have any info on the amp specifically? I went to a few sites, and they dont even list this line under the product history of Sansui. Its been described as a combo rack system? Whats the difference between the regular AU type amps? Any help would be greatly appreciated, thanks.