Tube Power Amp Reviews

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Robert Harley Posted: May 31, 2011 Published: Jan 01, 1990 0 comments
The VTL 225W DeLuxe monoblocks are very similar to the 300W monoblocks that received such an enthusiastic reception from J. Gordon Holt a year or so ago (in Vol.11 No.10) and, ultimately, most of the audiophile community. Technically, they differ only in output tubes and transformer: the 225W uses EL34s, the 300W uses 6550s. The 225Ws, at $4200/pair, cost $700 less than their more powerful brothers. The question may be raised: Why have two models so close in price and performance? According to David Manley, the 225Ws were built on special order for audiophiles who preferred the sound of EL34s to the 300Ws' 6550s. Demand was so great for the EL34 version that he decided to add it to the line. They look almost identical, the only difference being the smaller output transformer on the 225W and an additional filter capacitor on the 300W's top chassis.
Jonathan Scull Posted: Aug 08, 2011 Published: Oct 01, 1996 1 comments
Most reviewers look for a "hook" or angle of some kind when it comes time to write a review. After all, how many ways are there to get excited about audio equipment? Kathleen and I like to focus on the human side of the High End. So it was with some amusement that I watched the obstacles swirl around what I thought would be a fairly straightforward review of the Vacuum Tube Logic MB-1250 Wotan monoblock power amplifier. My thought was to return from single-ended to push-pull with a bang! I'll say...

It all began at the January 1996 WCES, where I found my shorts positively welded to the listening chair during a memorable musical blast at VTL. Luke Manley and his extreme audiophile wife Bea had a good thing going and they knew it. People were talking. "Did you hear those monster two-storey VTLs on the Alón Vs?"

Michael Fremer Posted: Jan 29, 2008 0 comments
Stop me if you've heard this one: Back in the early 1990s, just after the fall of the Soviet Union, I debated professor of music engineering and magazine columnist Ken Pohlmann on a talk show on the CBS radio network. The subject was analog sound vs digital sound, but I guess when Pohlmann felt I was getting the upper hand, he felt he needed to play the tube card. Derisively, he said, "I bet you're one of those tube guys, too, aren't you?" Before I could open my mouth, he continued: "You know, the Soviet Union's military gear, including the MIG fighters, ran on tube electronics, and look what happened to them!"
Michael Fremer Posted: Apr 26, 2011 0 comments
The VTL MB-450 series began life in the late 1980s as the Deluxe 300, a pair of which I once owned. Over the years the basic design has been improved and modified, in the forms of the MB-450 (1996) and the MB-450 Series II (which I reviewed in January 2008). The tube complement remains the same: eight 6550s in the push-pull output stage, a 12AT7 input tube, and a 12BH7 driver. Into a 5 ohm load, the MB-450 III is claimed to produce 425W in tetrode mode or 225W in triode, from 20Hz to 20kHz.
J. Gordon Holt Posted: Oct 20, 1995 Published: Oct 20, 1988 0 comments
Not only does the venerable vacuum tube refuse to lie down and die, as everyone predicted when audio went solid-state; it continues to deliver better performance than anyone had imagined it could. Only a few years ago, we could characterize "the tube sound" as being sweet but soft at the high end, rich but loose in the midbass, deficient in deep bass, and bright and forward, usually with excellent reproduction of depth. Since then, we've seen the introduction of what might almost be called a new generation of tube amplifiers, which rival solid-state units in those areas where tubes used to have weaknesses, but have given up little of the tube's sonic strengths.
Brian Damkroger Posted: Dec 03, 1997 0 comments
How much power do you really need? What does it do for you, anyway? Even before the single-ended renaissance, the prevailing wisdom was that you really didn't need that much power. When I had a pair of Met 7 speakers, even the "1 watt" indicator LED was hardly ever lit. Ditto for my time with a Threshold Stasis Two—all those cool power-indicator LEDs just sat there dark. Besides, everyone knows that power can be had only at tremendous cost, both monetary and in terms of other performance attributes.
Brian Damkroger Posted: Dec 24, 2005 0 comments
When I reviewed VTL's MB-750 monoblock amplifier in the December 1997 Stereophile (Vol.20 No.12), it was a transitional time for the company. Luke Manley had recently taken it over, and he and his wife and partner, Bea Lam, were aggressively retooling. They introduced new business systems, including rigorous inventory and quality control; rebuilt VTL's dealer network around top-rank dealers; and systematically upgraded the products themselves to improve their consistency, reliability, manufacturability, and performance. VTL's goal, Luke explained to me at the time, was to build amplifiers that competed with the very best, and to "make the tubes invisible to the customer."
Michael Fremer Posted: May 02, 2014 0 comments
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.
Lonnie Brownell Posted: Feb 26, 1999 0 comments
"More power!!!"
Corey Greenberg Posted: Nov 05, 2006 Published: Apr 05, 1991 0 comments
During the time of the Native-American Comanches, a young brave had to undergo many trials by fire before he earned the respect of the tribe's adults. He was violently beaten by the men, humiliated by the women, and forced to endure physical torture such as the slow flaying of the foreskin with smoldering pine saplings drawn from the fire. Alienated from the tribe, exiled until he proved his manhood, he had to survive on wriggling cream-colored larvae and infrequent rainwater. Legend speaks of these Indian youths, dehydrated and disoriented, crawling around on their hands and knees and baying like wolves at the moon.
Michael Fremer Posted: Jul 10, 2004 Published: Jul 01, 2004 0 comments
Leaving aside for a moment the fact that the Wavac SH-833 costs $350,000/pair—
Jonathan Scull Posted: Apr 04, 2004 Published: Jan 01, 1996 0 comments
We have to talk. Are you sitting comfortably? Is the reading light okay? Have a little something to drink at hand? (Audio is thirsty business.) The audio world is abuzz over the reintroduction of the single-ended triode amplifier. This is the first of three reviews of such amplifiers I'll be bringing you, along with two speaker systems with which to play them.
Robert Deutsch Posted: May 20, 2001 0 comments
"I'm a fan of tubes—I don't like designing with them, but I do like listening to them."—Paul McGowan, Stereophile interview, May 2000
Larry Greenhill Posted: Aug 26, 2007 Published: Jun 26, 1994 0 comments
Brian Tucker, the US Quad importer, introduced me to the Woodside MA50 tube amplifiers and their manufacturer, John Widgery, during the 1992 Summer CES. Tucker's combination of Woodside MA50 tube amplifiers and Quad ESL-63 USA Monitors sounded unusually neutral, dynamic, and detailed. This was good news; back in 1987, Dick Olsher (Vol.10 No.6, pp.104–5) was unable to recommend an earlier Woodside-manufactured amplifier, the Radford STA 25 Renaissance. Brian mentioned that the MA50's design is a much-improved version of that earlier Radford model. Time for another review.
Art Dudley Posted: Mar 17, 2006 0 comments
My stepfather wore only second-hand clothes as a child and never understood why anyone would deliberately wash the color out of his new dungarees. By the same token, the senior members of our hobby, many of whom recall with fondness the transistor's advent, don't understand why anyone would now wish to throw away their newfound power. Some people deserve to be blessed for their point of view, even as the world moves away from it.

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