Phono Preamp Reviews

Among the electrically connected, the phrase short circuit induces panic and horrific images of tripped breakers, blown fuses, acrid blue smoke, and melted circuit boards. Nonetheless, near short circuits are becoming popular among the analog set. Moving-coil cartridges of an inductance and impedance so low they're nearly short circuits are now more common, thanks to powerful neodymium magnets that help produce more and more electrical output from fewer and fewer turns of coil wire. Perhaps the most extreme example of this is the Haniwa HCTR01 Mk.II cartridge, which has an internal impedance of 0.4 ohm and an inductance of 0.3µH.

As a kid growing up in Milford, Michigan, my big brother always had the classiest clothes, latest records, and sharpest gear. He danced in Cuban-heeled leather boots, I climbed trees in lace-up Keds. He spun Rolling Stones vinyl on a fabric-wrapped Zenith portable with detachable speakers, I blasted the Beatles from a tinny transistor radio. Ten years my senior, big bro drove a Buick bomb (which, late one night, mysteriously caught fire in the garage) and had a girlfriend, Gail, whose plump cheeks and smart clothes embodied modern mid-century Midwestern appeal. I like to think that my brother and I have both aged gracefully. And lately, he's taken to high-end hi-fi with a passion.

How can you tell a classic product from the hi-fi hoi polloi? One sure sign is when third-party developers spring up around the thing, offering parts and service intended to maximize its performance—or just to keep it on the road. Thus regarded, a few true classics emerge: Quad's ESL and ESL-63 loudspeakers. Altec's 802 and 806 compression drivers. The Linn LP12 and Garrard 301/401 turntables. The Rega RB-300 tonearm and its direct descendants.

Maybe you've seen the widely circulated New Yorker cartoon: Two guys stand in front of a nicely drawn, tubed audio system, under which are shelves full of LPs. One guy says, "The two things that really drew me to vinyl were the expense and the inconvenience."

If you can't laugh at that, you've lost your sense of humor—even acknowledging that, oddly, convenience is the raison d'etre of some recent phono preamplifiers—including Dan D'Agostino Audio's Momentum and the CH Precision P1, both of which offer multiple, switchable, configurable inputs saved in memory. Today's well-heeled vinyl enthusiast might have two or more tonearms mounted on a single turntable—or even two turntables, each with two arms. Zesto Audio's new Andros Téssera tubed phono preamplifier takes aim at that market segment.

Although Swiss-based CH Precision is a relatively young company, its core design team has been involved in high-performance audio for many years. Their website doesn't state the company's age, but something there did provide a hint: Among the design team's previous activities was work for another Swiss company, Anagram Technologies...I hadn't made the connection between Anagram and CH Precision when Raphael Pasche, the latter's electronics design engineer, visited last fall to install CH Precision's P1 dual-mono phono stage and the optional X1, a discretely regulated, outboard linear power supply that's claimed to exhibit ultralow levels of noise. The P1 can be ordered as a stereo preamp for $31,000; add $17,000 for the identically sized X1 power supply. Or one mono P1 can be used for each channel, for $55,000 plus $34,000 for two X1s. Expensive stuff.

In contrast with such line-level source components as DACs and CD players, record players generate a lower-voltage signal that requires extra gain from either a standalone phono preamplifier or the phono stage of another, more comprehensive component in one's system—typically, a full-function preamplifier or an integrated amp.

But when the phono cartridge of choice is a moving-coil (MC) type, which generates even less voltage than its moving-magnet (MM) and moving-iron (MI) friends, even more gain is required. This presents the user with an additional choice: he or she can select from among the many standalone phono preamps that offer sufficient gain, or augment an existing phono or full-function preamp or integrated amplifier with a phono step-up transformer, which boosts gain passively, without using tubes or transistors.