Tube Power Amp Reviews

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Michael Fremer  |  Jun 06, 2004  |  First Published: Dec 01, 2001  |  0 comments
"Moi? You want moi to review a French audio product?"
Michael Fremer  |  Nov 03, 2008  |  First Published: Nov 03, 1999  |  0 comments
Based in the Czech Republic, KR Enterprise is headed by an occasionally gruff Dr. Riccardo Kron and his American-born wife, Eunice, who operate the company out of a partially abandoned factory that was once part of the state-owned Tesla High Vacuum Technology facility in Prague. The Swiss-funded company is unique in that it manufactures both amplifiers and the tubes that power them. KR's tubes have found favor with other amplifier makers as well—especially the 300BXS, electrically identical to a standard 300B but rated at 25W in class-A.
Jonathan Scull  |  May 20, 2000  |  0 comments
The last Lamm product I had my hands on was a pair of M1.1 monoblocks (see Vol.18 No.4, Vol.22 No.7). I liked those hybrid tube/solid-state amps quite a lot.
Michael Fremer  |  Sep 06, 2013  |  First Published: Sep 01, 2013  |  12 comments
Even as the gulf narrows between the sounds of the best solid-state and the best tubed amplifiers, most listeners remain staunch members of one or the other camp. Similarly, when it comes to video displays, the plasma and liquid-crystal technologies each has its partisans, though that conflict's intensity is relatively mild, perhaps because video performance, unlike audio, is based on a mastering standard that establishes color temperature, gray-scale tracking, color points, and the like (I'm deeply in the plasma camp). But in audio, the "standard" is whatever monitoring loudspeaker and sonic balance the mastering engineer prefers, which makes somewhat questionable the pursuit of "sonic accuracy." Still, in a power amplifier, a relative lack of coloration is preferable to amps that Stereophile editor John Atkinson has characterized as "tone controls"—usually, if not exclusively, of the tubed variety.
Art Dudley  |  Oct 23, 2004  |  First Published: Oct 01, 2004  |  0 comments
One of my best friends is a serious jazz collector with a side interest in good replay gear. The last time we got together over a meal, he asked, "What do you think is really the most important component in an audio system?" He might have added "these days": It's a subject we come back to from time to time.
Art Dudley  |  Apr 05, 2013  |  2 comments
The challenge is biblical in character, if not in scope: A half year after railing, in these pages, against our industry's overabundance of products that cost more than $20,000, fate has given me such a thing to review.
Herb Reichert  |  Sep 26, 2017  |  14 comments
I have always been fascinated by audio power amplifiers. I even tried building about a hundred of them. My best friend in high school, Bill Brier, taught me the basics of soldering, wire management, and reading schematics. He loaned me his Dynaco Stereo 70, and gave me a hot-running, 20W, class-A transistor amp that he'd built on his mother's kitchen table. Bill took me to concerts, and taught me about classical and jazz music. He had perfect pitch, tuned pianos for money, played every instrument in the orchestra, and had memorized the complete keyboard works of J.S. Bach before he turned 16. And this stuff was all on the side—mainly, we built drag race cars together.
Art Dudley  |  Jan 07, 2012  |  6 comments
"Have you really listened to all those records?"

My guest, an occasionally nice person, didn't mean her question in a nice way. It was pointed and derisive: a needle intended to burst whatever it was that made me think filling a room with thousands of LPs was a good idea. She didn't wait for an answer—it would have been "Not quite"—but I half think she half expected me to see reason on the spot.

Art Dudley  |  Mar 08, 2012  |  2 comments
Years ago, while editing Listener Magazine, I received a call from a record-company publicist with whom I was friendly: The drummer Ginger Baker, whose work I admire, was promoting a new release, and we were offered a 30-minute telephone interview with the artist. I jumped at the chance, but wound up leaving the article in the can—partly because it was so short, partly because its subject was so cranky. As with vacation trips to certain locales, second prize would likely have been 60 minutes with Ginger Baker.
Art Dudley  |  Jan 28, 2014  |  First Published: Feb 01, 2014  |  17 comments
Domestic audio is based on two simple processes: transforming movement into electricity and electricity back into movement. Easy peasy.

Audio engineers have been doing those things for ages. Have they improved their craft to the same extent as the people who, over the same period of time, earned their livings making, say, automobiles and pharmaceuticals? I don't know. But if it were possible to spend an entire day driving a new car from 50 years ago, treating diabetes and erectile dysfunction with the treatments that were available 50 years ago, and listening to 50-year-old records on 50-year-old playback gear, the answer might seem more clear.

Art Dudley  |  Jul 01, 2014  |  4 comments
It's going to happen very soon.—Leonard Cohen, "The Great Event"

With a parts list that includes 18 new-old-stock Black Cat capacitors, 16 vintage-style Cosmos potentiometers, two Tango chokes, one Tango power transformer, and some of the loveliest steel casework I've seen on a contemporary product, no one could accuse Noriyuki Miyajima of skimping on the build quality of his company's only power amplifier, the Miyajima Laboratory Model 2010 ($9995, footnote 1). Then again, because the 2010 is an output-transformerless (OTL) tube amplifier, Miyajima-san spent considerably less on iron than would otherwise be the case. Think of the money he saved!

Art Dudley  |  Aug 28, 2018  |  15 comments
For this month's column, I did something I've occasionally set out to do but never quite managed: I lived with a new power amplifier for nearly two months, used it to enjoy a variety of records, made scads of listening notes, and wrote most of the subjective portion of my review—all without knowing what was inside it.
Art Dudley  |  Jul 25, 2019  |  4 comments
Products come and go. Some impress more than others, and in our little world, the ones that impress the most wind up in Class A of our semiannual "Recommended Components" feature.

After a product makes it to that list, if Stereophile's reviewers go more than a few years without hearing it again—in a home system or a dealer's showroom or even at an audio show—that product falls off the list, usually quietly. Thus, if a reviewer is maximally knocked out by a piece of playback gear, yet the fates allow neither a purchase nor an extended loan, he or she or someone else on staff must endeavor to borrow it again so it can stay recommended.

Art Dudley  |  Jan 28, 2020  |  87 comments
Only recently did I learn that successive generations of the Chevrolet Corvette are referred to by the cognoscenti with two-character alpha-numeric identifiers: C1, C2, C3, and so on. I learned this while reading about the most recent version—C8, known to non-cognoscenti as the 2020 Corvette—which happens to be the first version since C2 that impresses me. (I say that as one who used to work for the owner of a C3, a then-middle-aged male who actually boasted, while under the influence, that he and two of his C3-owning friends drove them solely because their juvenile styling attracted juveniles. Rest assured I left his employ within days of that revelation.)
Art Dudley  |  Apr 29, 2007  |  0 comments
"Men must eat, though angels be their guests."
—William Laird, "Träumerei at Ostendorff's"

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