Art Pepper, who died in 1982 at the age of 56, was not only one of the great alto saxophonists of his era but a self-transformer to boot. In the early 1950s, he routinely ranked No. 2 in Downbeat polls (beat only by Charlie Parker), then vanished in the '60s (locked up in various prisons on drug charges), only to emerge in the mid-'70s with a totally different sound.

It seemed a simple and obvious question, but I couldn't get an answer out of Ron Sutherland. Why did his new 20/20 phono preamp use an AC power supply instead of batteries? I asked directly, I asked repeatedly, I tried framing the question in different ways, all to no avail. Did the AC supply make it sound better? Was it less expensive to build? Were potential customers turned off by having to replace batteries once every year or two?