I've gone back and forth on the Sun Audio. It is true that simpler circuits are _not always_ better and I think it came from the hazy days of japanese jazz kissas. think NOS speaker cabling, WE , Beldon etc. Those are all fine, but not really what I've been building in my own systems. I prefer things a bit more modern.
I looked at AN's 300B's going back a couple decades. I couldn't see all the schematics but they are not as simple as the Sun Audio and they moved away from 6Sn7. But AN and everyone else says, why bother running 300b in NF... I agree, makes no sense in single ended design. Rather, put higher quality components in. Before I buy I may as the question on Victor's DIYAudio thread.
Also, I have an idea to sandblast and paint the SV chassis, so I'm a bit up to the challenge.