Quantcast
Channel: Tube Power Amp Reviews
Viewing all 90 articles
Browse latest View live
↧

PrimaLuna DiaLogue Premium power amplifier

January 30, 2014, 6:20 pm
$
0
0
The road to hell is paved with good inventions: clever ideas that appear, in hindsight, motivated more by a desire to sell clever ideas than to make musically superior products.

The DiaLogue tube amplifiers from PrimaLuna have, at their heart, a clever idea of their own: an output circuit that is user-switchable between triode operation, in which the screen grid of a tetrode or pentode power tube is defeated by means of connection to the tube's anode; and Ultralinear operation, in which the screen grid of a tetrode or pentode carries a portion of the AC music signal, supplied by a tap on the output-transformer primary, in a feedback-like effort to reduce distortion and increase power. Fans of the former often report a sweeter, more tubey sound, while fans of the latter report a tighter, more detailed, more timbrally neutral sound. Audio enthusiasts are given to reporting any number of things.

Sat, 02/01/2014
↧
Search

VTL Siegfried Series II Reference monoblock power amplifier

May 2, 2014, 10:15 am
$
0
0
Big tube amplifiers were once scary monsters reserved for those who didn't mind heavy maintenance, careful tweaking, and the occasional explosion. Blown tubes required replacing, preferably with pricey matched pairs, then biasing with a voltmeter. Optimal sonic performance required regular bias monitoring and adjusting, and because of current surges on startup, you had to choose between leaving the heat-producing monoliths on, or turning them on and off for each listening session, thus shortening the life of the tubes.
Fri, 05/02/2014
↧
↧

Raven Audio Spirit 300B Reference Stereo power amplifier

May 2, 2014, 10:26 am
$
0
0
No one can say precisely how or when the ancient 300B triode tube made its cross-kingdom leap to the modern world of consumer audio, but we've got the where pretty much nailed down: It all began in Asia, where the best of the West is sometimes held in reverence rather than left to drown in consumerism's wake. Asia is the final resting place for the great Western Electric cinema systems of the 1940s—and that's where the 300B earned its un-American second act. By the mid-1990s, the tube had captured the hearts of hobbyists who, consciously or not, sensed that the audio refineries of the day had lost the plot, not to mention the body.
Fri, 05/02/2014
↧

Listening #139

July 1, 2014, 5:20 pm
$
0
0
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!

Tue, 07/01/2014
↧

VTL Compact 160 monoblock power amplifier

August 13, 2014, 2:43 pm
$
0
0
891vtl160.250.jpgWhen I reviewed VTL's 25W Tiny Triodes in April 1991, I found them to be incredibly fun little suckers to play with, but got frustrated with their inability to drive my Spica Angeluses to reasonable levels with most of my recordings. I loved what I was hearing, but there wasn't nearly enough of it! As it turns out, John Atkinson was listening; not just to my plea, but also to the new VTL Compact 160 monoblocks in preparation for a full review. However, while all this was going on, David Manley decided that the power-supply voltages in the 160 weren't beefy enough to exploit his new KT90 output tubes; back the amps went for a transformerectomy.
Thu, 08/01/1991
↧
↧

Siltech SAGA power amplifier

October 10, 2014, 12:57 pm
$
0
0
Among the biggest buzzes at the January 2013 Consumer Electronics Show, and at Munich's High End Show the following May, was the sound in the room of Siltech BV, a Dutch company best known for its high-end cables. Siltech was demonstrating an innovative new power amplifier, and using it to drive the company's glass-cabineted Arabesque loudspeakers ($90,000/pair). The sound was unmistakably lush yet also remarkably linear, notably dynamic, and seemingly free of electronic artifacts. It sounded like the sound of "nothing"—which was really something!—and so much of a something that it caught the attention of many reviewers. But while there's often controversy and disagreement about a given product's sound quality, this time the enthusiasm seemed unanimous.
Fri, 10/10/2014
↧

Air Tight ATM-1S power amplifier

November 12, 2014, 9:40 am
$
0
0
It's no secret, especially to those who've been following Stereophile for more than a short time: In the first half of 2007, I took the plunge and bought a Shindo preamplifier and monoblock amplifiers—handmade products characterized by low output power, generous numbers of vintage parts, steel casework finished in a signature shade of green, and richly textured, impactful sound with lots of sheer musical drive. And while we tend not to alert the major newspapers whenever someone on staff buys new electronics, the change was notable for two reasons: The compatibility of Shindo's amplifiers is limited to loudspeakers of higher-than-average sensitivity and impedance; and, throughout the seven years that followed my switch to Shindo (footnote 1) both my system and my point of view regarding domestic audio in general have evolved in the direction of the artisanal and the vintage.
Wed, 11/12/2014
↧

Thöress 300B monoblock power amplifier

April 3, 2015, 12:06 pm
$
0
0
I was weak and easily led.

In 1978, after enduring four or five years of wretched music made by men with long hair and beards and tendencies toward eonic guitar solos, I suddenly discovered that the only music worth hearing was made by clean-shaven men of limited musical proficiency. I embraced the Clash, the Pistols, the New York Dolls, the Ramones, and the Buzzcocks. I cut my hair and gave away some of my old records. I even threw out my copy of Jethro Tull's A Passion Play—which, now that I think about it, wasn't that bad an idea.

Then I woke up and remembered: I'd left the baby in the bathwater.

Fri, 04/03/2015
↧
Search

Vandersteen Model Seven Mk.II loudspeaker & M7-HPA monoblock power amplifier

April 22, 2016, 9:59 am
$
0
0
Driving the Model Sevens at the 2014 CES were Vandersteen's then-new M7-HPA monoblocks, which provide a high-pass–filtered output (above 100Hz) to the upper-frequency drive-units of the Model Seven. At the time, I made a note to myself that I would like one day to try these amplifiers with the Sevens in my own room. That opportunity came later rather than sooner, after Vandersteen had updated the Model Seven to Mk.II status.
Fri, 04/22/2016
↧
↧

PrimaLuna ProLogue Premium power amplifier

November 2, 2016, 6:55 pm
$
0
0
Let us pretend . . . you have a pair of loudspeakers that have proven themselves to sound articulate and musically responsive in your room, without excess boom, bloom, or frail leanness. They mate with your décor and impress your friends. But maybe you're bored, and feel certain that your speakers would sound better with a better amplifier than the one you have now. Maybe you feel an urge to spend money? Perhaps a new amp will make your records sound the way you imagine they should sound?

I have had these thoughts many times.

Wed, 11/02/2016
↧

VTL/Manley Reference 350 power amplifier

August 1, 2017, 1:53 pm
$
0
0
Manley is not a new company; it's the last name of the president and chief designer of VTL, David Manley, whose Model 300 has been my reference standard power amp for the past two years. In fact, Manley is not even a new brand name; it's the name of VTL's "deluxe" line of electronics, built (ostensibly) to industrial standards of ruggedness and reliability.

It's customary to think of "the tube sound" as being warm, rich, weak through the deep bass, fat through the midbass, forward through the midrange, bright through the middle highs, and soft at the extreme top, with superb rendition of depth and spaciousness. The "solid-state sound," by contrast, is generally thought to be cool, detailed, and pristine, with powerful deep bass, controlled midbass, rather reticent (laid-back) midrange and mid-highs, and a somewhat crisp high end, with variable (roulette-style) reproduction of depth and spatiality.

Fri, 02/01/1991
↧

Linear Tube Audio ZOTL40 Mk.II power amplifier

September 26, 2017, 12:32 pm
$
0
0
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.
Tue, 09/26/2017
↧

Margules Audio U280-SC Black power amplifier

November 2, 2017, 10:57 am
$
0
0
Prelude
The setting of the Prelude to our opera, The Margules Saga, is the California Audio Show, in August 2012. There, on first hearing Margules Audio's tube electronics, I wrote in my notebook, "great inner vitality, warm but with a welcome and appropriate bite." An encounter the following January inspired me to write, of a system that included an earlier version of the company's U280 amplifier, "The sound? Beautiful and warm. I've heard these electronics at two shows, and each time, I've left the room feeling good."
Thu, 11/02/2017
↧
↧

Jadis JA 200 monoblock power amplifier

November 10, 2017, 10:18 am
$
0
0
Ron Cox, Zen master and good friend from Zuni, New Mexico, gingerly navigated the crowded streets of Amp City—the essentially all-tube amp collection sprawled on my listening-room floor between the speakers. Ron had no trouble spotting the four chrome-and-black chassis of the JA 200s. He pointed a tentative finger: "Are those the Jedi?"
Mon, 11/01/1993
↧

Jadis JA200 Mk.II monoblock power amplifier

February 1, 2018, 11:54 am
$
0
0
"How natural the sound," wrote Jonathan Scull in March 1994, in his Follow-Up on the original Jadis JA 200 monoblock amplifier, which then cost $18,990/pair. "How easy it was to follow the musical line and fall into the music. How deep, controlled, tight, and satisfying the bass. How magnifique the midrange—the traditional strength of the Jadis presentation. How full and satisfying the lower midrange. How open, airy, how right the highs—not at all hard, but very extended and natural. How involving their presentation. How full, how harmonically correct, how wonderfully compelling. How magical."
Thu, 02/01/2018
↧
Search

Ypsilon Electronics Hyperion monoblock power amplifier

March 22, 2018, 4:51 pm
$
0
0
Designers of hybrid amplifiers can use solid-state devices in an amp's input stage and tubes in its driver and output stages, as Music Reference's Roger Modjeski did in his RM-200 Mk.II—or they can use tubes in the input and transistors in the output, as Ypsilon Electronics' Demetris Baklavas prefers.

The advantage of solid-state at the input stage can be lower noise. In the RM-200 Mk.II's fully balanced design, carefully matched input devices result in high common-mode rejection and low-noise operation close to the levels achieved with the best input transformers. The RM-200 Mk.II's signal/noise ratio measured a healthy 95.4dB.

Thu, 03/22/2018
↧

BorderPatrol P21 EXD power amplifier

June 21, 2018, 1:58 pm
$
0
0
Back at the beginning of 2017, Greg Roberts, of Volti Audio, devised a clever way to bring his Rival floorstanders up to my penthouse pad, for what resulted in a rave review of those horn-loaded wunderspeakers.

I live on the top floor of a seven-story, elevatorless building on a busy street in Greenwich Village. A vertical challenge? No problem! Roberts is resourceful in many things, from speaker design to his former profession, the building of custom homes. Affixing a pair of unguent-saturated straps to the screws on each side of a Rival, we lifted and transported the 106-lb speaker high in the gritty Manhattan sky as if it were child's play.

Thu, 06/21/2018
↧
↧

New York Audio Laboratories Futterman OTL-1 power amplifier

August 7, 2018, 12:39 pm
$
0
0
Few people in the high end know the difference between glorious excess and wretched folly as well as Harvey Rosenberg (footnote 1). Harvey's audio equipment always strives towards the glorious folly of providing the most romantic sound possible with modern technology. This may explain why his relatively small company, New York Audio Laboratories, can build an amplifier like the Futterman OTL-1, which costs a glorious $12,000 a stereo pair and actively competes for the title of best amplifier in the world.
Mon, 09/01/1986
↧

Listening #189: Luxman MQ-88uSE

August 28, 2018, 11:46 am
$
0
0
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.
Tue, 08/28/2018
↧

Audio Research Reference 160M monoblock power amplifier

September 20, 2018, 12:26 pm
$
0
0
At a recent dealer event in Seattle, after being impressed by the musical rightness of an Audio Research Corp. LS28 preamplifier and VT80SE power amplifier driving a pair of Sonus Faber Guarneri loudspeakers, I spoke with ARC's Dave Gordon about reviewing one of the company's new amplifiers. Less than a month later, two ARC Reference 160M tubed monoblock amplifiers ($30,000/pair) were headed my way.
Thu, 09/20/2018
↧
Viewing all 90 articles
Browse latest View live
Search
<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>