I'm not sure this is really that remarkable, he just had a personality and got some attention.
There have been high-quality amplifiers around for a long time now and Class T (http://www.google.com/patents/US5777512) amplifiers at that pricepoint are over a decade old. They're very popular with DIY audio guys. I've had my Trends TA-10 close to 10 years old now.
He did something cool, but I don't see it as all that remarkable.
I'm a pretty intensive electronics enthusiast. I checked out his site, and skimmed some of the materials.
My impression is that he deliberately designed a fairly mundane circuit using commonplace parts, to show that an esoteric design is unnecessary. So it's a "political" design, if you will.
The impressive thing is that his documentation of design decisions and techniques is pretty exhaustive. I've definitely bookmarked it for a closer read.
There have been high-quality amplifiers around for a long time now and Class T (http://www.google.com/patents/US5777512) amplifiers at that pricepoint are over a decade old. They're very popular with DIY audio guys. I've had my Trends TA-10 close to 10 years old now.
He did something cool, but I don't see it as all that remarkable.