It was no accident that residential architect Mark Cronander, aka Variac, scheduled the Sixth Burning Amp DIY Fest for October 28, on the same weekend that the AES Convention (Audio Engineering Society) took place in San Francisco. Not only did Cronander attract a fair number of new folks who came into town for the convention, but he also scored, as a speaker, class-D amplification expert Bruno Putzeys of Belgium's Hypex Electronics.

I've heard a lot of great audio components over the years, but even in that steady stream of excellence, a few have stood out as something special. These are the products that, in their day, set a new standard for performance, and many of them are ones I wish I'd hung on to. Among these products are three preamps from Audio Research: the SP3A, the SP6B, and the SP10 (footnote 1). I know I'm not alone in viewing these models as classics.