Tube Preamp Reviews

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Melos SHA-Gold headphone amplifier

It's hard to know what to call the SHA-Gold. It is a superb headphone amplifier—maybe even the target all future headphone amps need to shoot at—but it's also a full-function preamplifier. At two grand, it's not exactly a unit you'd add to your current system just to get a headphone connection...Wait a minute! What am I saying? I'm sure that there are folks out there who would add this to their existing reference systems as casually as I'd buy the Audio">http://www.stereophile.com/headphones/796alchemy">Audio Alchemy headphone amplifier—but they'd be missing out on a great line stage.

Miyajima Lab Wo-1 preamplifier

A phenomenon formerly unique to Japan, which in recent years has been emulated in cities around the world, is the jazz café (known as jazz kissa in Japan), where salarymen can find respite from their hectic lives, loosen their ties, and enjoy hi-fi jazz over coffee or a drink. Jazz kissaten are typically charming, smaller shops, traditionally furnished and paneled in beautiful wood, which serve superb artisan coffee in artful ceramic cups.

Such respect for artistry, craftsmanship, and attention to detail—the Japanese word is shokunin—is reflected in many aspects of Japanese life. This is where you find double handrails to accommodate people of different heights, intricate, ornately designed manhole covers, and bento lunch boxes with hand-carved vegetable figurines. While upholding strict conformity to societal norms, the Japanese highly value creative individualism. This shokunin mindset underlies their reverence for artisanal expression—and their love for jazz.

Japanese audio, much like jazz kissaten, reflects the shokunin mindset: craftsmanship pursued with both pride and humility.

Musical Fidelity AMS Primo line preamplifier

Musical Fidelity's Tri-Vista kWP, introduced in 2003, was an impressive, high-tech, "statement" audiophile preamplifier. Its outboard power supply weighed almost 56 lbs—more than most power amplifiers—and its hybrid circuitry included miniature military-grade vacuum tubes. As I said in my">http://www.stereophile.com/solidpreamps/104mf">my review of it in the January 2004 Stereophile, the kWP's chassis and innards were overbuilt, the measured performance impressive, and any sonic signature imposed on the signal was subtle and, essentially, inconsequential.

Musical Fidelity kW Hybrid line preamplifier & kW750 power amplifier

Not every audiophile needs an amplifier powerful enough to tax a small town's power grid while simultaneously draining his or her bank account. So, having quickly sold out of its ultra-limited-edition, extravagantly powered and priced combo of kWp preamplifier ($14,995) and kW power amp ($27,995) that I reviewed">http://www.stereophile.com/tubepoweramps/104mf">reviewed in January 2004, Musical Fidelity (footnote 1) set about capitalizing on the enthusiastic reviews earned by those giants with less expensive, less powerful, "real-world" replacements.

Musical Fidelity Tri-Vista kWP preamplifier & Tri-Vista kW Monobloc power amplifier

Thoughts of power, domination, and audio road-rage enter one's mind when contemplating Musical Fidelity's SUV-like, limited-edition, 20th-anniversary offerings (footnote 1). (Only 75 sets of kWPs and kWs will be made.) The gleaming, brushed-aluminum, two-box, oversized, overweight Tri-Vista kWP preamp is fortress-like—the "kWP" looks as if chiseled into the faceplate by grimy, sweaty hands. Each of its boxes weighs almost 56 lbs. The unit's milled-aluminum remote control, the size of a Volkswagen Microbus and looking like something Fred Flintstone might wield, must weigh over 5 lbs. The kWP outputs more juice than many power amps: 55V, with 20 amps of peak-peak instantaneous current!

Nagra PL-L preamplifier

Unpacking and installing a new component is always cause for excitement, even if one does it with almost mechanical regularity, and the anticipation is greater when the component is from a manufacturer of almost mythic reputation. So when John Atkinson asked if I'd like to audition Nagra's new PL-L preamplifier, I feigned calm as I accepted the assignment, even while remembering those years in college radio when I had to schlepp big Ampexes and Maggies. The sexy, portable Nagras were the stuff of dreams. Finally, I thought, I'd get my hands and ears on one.

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