In fact the SU-V series of amps are interesting. One of the many attempts at playing around with Class A designs back in the day. Pioneer and Victor (JVC) were also playing around and building their own versions of Class A. Yamaha sort of had a go with their HCA circuit (that is very good BTW). All marketed under various marketing names such as - New Class A, Super A etc. Certainly these amplifiers may well sound nice. but are very different to a Yamaha A-S3000.