Integrated Amp Reviews

Once upon a time, reviews of Musical Fidelity components frequently filled pages in Stereophile. But in all my years covering audio shows, I can't recall blogging about any of the company's products, not even once. So, when my editor offered a review of the new M8xi ($6490), a hefty 101lb dual-mono integrated amplifier that includes a DAC, I seized the opportunity to fill a black hole in my consciousness. (Kindly cast aside thoughts that it would take more than a hunk of audio equipment to fill the black hole in my brain.) As long as I didn't break my back lifting the M8xi, solo, to the top shelf of my rack—for this I humbly beg assistance from spouses, neighbors, and friends—new vistas were in store.

The very first Nu-Vista product was a preamplifier dubbed the Nu-Vista PRE. Launched in 1997, it was the second audio product to utilize nuvistors, small, metal-clad vacuum tubes introduced in 1959 to compete with bipolar-junction transistors. The first power amplifier to utilize nuvistors was the ovoid Nu-Vista 300.

Nuvistors—miniature, small-signal, vacuum tubes made of metal and ceramic—were introduced by RCA in 1959, at the dawn of the transistor revolution. RCA used them throughout the 1960s in its New Vista line of television sets, mostly in the tuner section. But by the early 1970s, solid-state devices had all but replaced tubes, nuvistors included (with a few notable exceptions). Ampex based the electronics of its well-regarded, late-'60s MR-70 open-reel tape deck on nuvistors, which were also used in microphone preamplifiers—in both cases for their very low noise and reputation for reliability and long life. For a time, Conrad-Johnson used them as well. While nuvistors may seem exotic today, they're hardly rare. On eBay you can find for sale hundreds if not thousands of used and new-old stock (NOS) nuvistors, as well as nuvistor sockets, without which the tubes are less easy to implement. (But they can be, and often are, hard-wired into a circuit.)

Specialization seems to be an inevitable consequence of progress: As the products of man and God become more and more complex, they're called on to do fewer things in more focused ways.

My first trip to a Consumer Electronics Show, in January 2010, was an eye-opener. Not only had I never before seen the phony glories of Las Vegas, it was the first time I'd been to a high-end audio show. Between the offerings on the top floors of the Venetian and T.H.E. Show at the Flamingo, I met some great people and heard some wonderful new products. One of those people was distributor Kevin Deal, and one of those new products was from Mystère. Though I was familiar with the PrimaLuna line that Deal also distributes, Mystère was, well, a mystery. However, after a listen to the Mystère pa21 power amplifier making a pair of MartinLogan speakers sing, and after noting the reasonable prices for some of Mystère's beautifully designed and built amps, I put Mystère in my review queue.

In 2015, the venerable Canadian audio company NAD introduced its soon-to-be-popular D 3020 integrated amplifier ($499), which combined 30Wpc output, streaming capability, and an onboard DAC in a slick, contoured case. NAD's latest D/A integrated also smartly combines trend with functionality, lifestyle convenience with technological advancement. The C 328 Hybrid Digital amplifier ($549) goes its older, smaller sibling a couple steps better in features, while reverting to NAD's traditional look: an unfancy box finished in a dark shade of matte gray with subtle white lettering and logo.

At the extreme high end—Halcro, VTL, Boulder, etc.—reviewers gush about a lack of character. If you're paying $20,000, you want a preamplifier or power amp to disappear. At those price points we also want extreme, unfatiguing resolution, and noise that's well below what most people would consider audible. But at those prices, an absence of character is definitely something most people aspire to.