Sam Tellig

Superphon's Revelation Basic preamplifier is made by Stan Warren, formerly the "S" of PS Audio, so it should come as no surprise that the Revelation Basic and the PS Audio Source sound much alike. The Revelation Basic sells for $399, assembled (no kit available). Like the Source, the Revelation has an outboard AC power transformer to minimize hum problems. But unlike the Source, the Revelation has dual volume controls (a pain) and lacks moving-coil capability.

I was all set to give up on moving magnets until the new Shure VI5-VMR (MR stands for Micro-Ridge stylus) arrived. In a word, it's terrific. I was slightly disappointed with the original V15-V: I just didn't think it was a significant improvement over the Type IV. What I missed was fine detail—especially in the high frequencies and during heavily modulated passages. The original V was not quite up to the sound of certain moving coils. Which is not to say the original V was a bad buy: moving coils cost twice the price and you need a stepup. I could recommend the original V without hesitation.

This is something we don't see too often: an entirely new approach to power amplifier design. As Quad points out in its literature for the 405, class-A operation of transistors provides the lowest distortion, but drastically limits the amount of power an output transistor can deliver without overheating. (Most transistor amps use class-AB output operation, in which each of a pair of power transistors handles part of each signal cycle and shuts down during the other part. Imperfect synchronism between the two halves causes the familiar "crossover distortion," which accounts for most solid-state sound. In class-A operation, each output transistor draws current though the entirety of each signal cycle, eliminating the crossover transition but doubling the amount of time current is drawn, and thus tending to cause the transistor to heat up more.)