Solid State Preamp Reviews

It isn't enough to say that engineer Denis">http://www.stereophile.com/artdudleylistening/404listening">Denis N. Morecroft is one of contemporary audio's few visionaries: He's one of a very few mature designers whose passion for doing things a certain way hasn't abandoned him in the least, and whose well-argued convictions seem stronger than ever. Thus, as others cave in to commerce—the tube-amp designer who offers a solid-state product just to help his dealers fill a price niche, the source-component manufacturer who rails against digital audio one day and starts cranking out CD players the next—DNM Design remains the likeliest of all modern companies to stay its course.

I can't think of a product that was as eagerly anticipated as was Ayre's KX-R preamplifier ($18,500). Following in the footsteps of Ayre's MX-R">http://www.stereophile.com/solidpoweramps/407ayre">MX-R monoblock amplifier, a Stereophile 2007">http://www.stereophile.com/features/1207poty/index9.html">2007 Product of the Year, and milled, like the MX-R, from a 75-lb billet of aluminum, the KX-R also shares with its monoblock stablemate the Ayre ethos of zero feedback and fully balanced operation. But what really caused the buzz was the declaration by Ayre founder and chief designer Charles">http://www.stereophile.com/interviews/610">Charles Hansen that the KX-R, with its use of a technology he calls Variable Gain Transconductance (VGT) to control the volume, would set new standards for signal/noise ratio.

Don't be confused by the MBL 6010 D's oddly baroque, even retro looks. Behind all the glitz—the oversize, perfectly finished, black-lacquered faáade; the two big, solid brass knobs plated with 24-karat gold; the ornate lettering; and the incongruous digital volume display—resides a thoroughly modern, remote-controlled, unusually versatile, and well-thought-out solid-state preamplifier. Not that the 6010 is a new design. It's been around for a long time, and the current "D" iteration is at least five years old.

Boulder Amplifiers, named after the Colorado town where the company has resided since its founding 23 years ago, makes some of the most elegant-looking solid-state amps around. Chassis are anodized, aircraft-grade aluminum with rounded edges, machined and finished in-house. The two models reviewed here, the 810 line preamplifier and the 860 power amplifier, each have a sleek, compact build—stacked atop each other, the two stand just over a foot high—owing to extremely efficient packing of the circuitry inside. These are the company's "entry-level" electronics, but there's nothing cheap about them—the preamp retails for $6900, the amp for $8500—and for all their economical size, they look like luxury goods as well.

A friend once described my audio ethos as "records, tubes, big amplifiers, and really big speakers"—I always picked warmth and musicality over antiseptic neutrality, even if the former came with a few extra colors in the tonal palette. Had I listed my criteria for an audio component, transparency wouldn't have been near the top, and might not have been listed at all.

The P-8 ($11,000) is the second of Simaudio's Moon Evolution series that has passed through my system, following on the heels of the Moon Evolution W-8 power amplifier, which I reviewed">http://www.stereophile.com/solidpoweramps/306sim">reviewed in March 2006. Fortunately, the P-8's arrival preceded the W-8's departure, so I was able to use them together as well as with other components.

Life used to be simple. A preamp was a phono stage, a line stage, and the controls necessary to manage a system. Sure, there were exceptions, but for the most part you could say "preamp" and everyone knew what you meant. With the rise of the Compact Disc, however, phono stages became standalone components or optional extras, and most manufacturers concentrated on the line stage and controls, pursuing the ideal of "a straight wire with gain."