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       M1.2 Reference
     
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       M2.2
    
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       ML1.1
    
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      ML2.1
    
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ML3 Signature
    
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LL2.1(regular/deluxe)
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VACUUM TUBE POWER AMPLIFIER


  

photography courtesy Mario Rodriguez

 


The ML1.1 is a direct replacement for the ML1 amplifier.  The ML1.1 features the following upgrades and modifications as compared to the ML1:

  • significantly simplified procedure for adjustment of the idle current and balance of the output stage tubes

  • addition of two user-friendly fuse holders -- one  accommodating the mains fuse and located on the rear  side, and another accommodating the plate fuse and located on top of the chassis right below the meters.  The plate fuse holder makes replacement of the plate fuse a snap compared to the ML1 amplifier, where it  was carried out by removing the amp's bottom cover.

  • power transformer upgraded to accommodate the 230V mains operation (in addition to the already existing 100/120/220/240V in the ML1)

  • modified output transformer

  • addition of two handles on the rear to make it easier to handle the amps and protect the rear panel connectors during transportation

  • heavy-duty speaker binding posts

  • utilization of better quality parts and materials that have become available in recent years


90W monaural power amplifier model ML1.1 represents a new generation of power amplifiers employing unique high current low impedance power vacuum tube triodes in the output stage.  Implementation of these triodes has allowed to create an output transformer with a very low turns ratio and, as a consequence, extended (as compared even to the most advanced modern vacuum tube amplifiers) frequency decade factor, as well as dramatically reduced leakage inductance. 

The ML1.1 topology had been chosen to bring out the most  natural sound  performance in the audio path.  Special aspects of the design enable the ML1.1 to recreate a three-dimensional  soundstage without boundaries and limitations while maintaining the extraordinary transparency of perceived sound.  A custom-designed output transformer had been significantly improved compared to that of the ML1; this transformer, along with a unique output stage, allow the ML1.1 to drive any real world speakers while maintaining proper harmonic structure and integrity of the amplified signal for all load conditions.  Two meters -- one for setting bias of the output stage tubes and another for measuring idle & maximum plate current  -- permit the user to easily control the output stage operation and simplify the replacement, if need be, of the output tubes.  

In conceiving and executing an overall design of the ML1.1, the goal was to utilize the modern technology and processes while recreating a look reminiscent of the long-gone genuine vacuum tube era.  Each amplifier is carefully constructed and handcrafted of the finest materials and world class parts, some of which include military graded low noise DALE metal film resistors; CADDOCK power film resistors; PRC wire wound resistors; BOURNS multi-turn potentiometers; ELECTROCUBE and ROEDERSTEIN film capacitors; high frequency switching grade CORNELL DUBILIER and UNITED CHEMI-CON electrolytic capacitors; HAMMOND chokes; gold plated NEUTRIC XLR connectors; military graded low noise long life vacuum tubes.  Special attention was given to designing the toroidal power transformer, which has no mechanical contact with either the transformer cover or the chassis and is suspended in a special encapsulant that almost completely absorbs even the residual mechanical vibrations.  This plays a significant role in assuring the absolutely unique clarity and micro-resolution during sound reproduction.

The ML1.1 works on all world AC line voltages (100/120/220/230/240V).

 

Here is what the prominent audio critics have said about the ML1.1

...I've used the word natural to describe various pieces of Lamm equipment, and it fits to the extreme with the ML1.1s. ... The ML1.1s are like the ultimate sonic smorgasbord: Everything is good, and you can have as much of it as you want.

In the lower treble and through the midrange, the ML1.1s preserve their ability to provide images that are sometimes startling in their solidity and presence, yet they don't tip over into an overly warm or even tubey presentation.

What the Lamm ML2s, and now the ML1.1s, have always done well is bass -- not in any showy way, but rather through a fine balance of weight and depth. The bass unfolds and isn't forced...

You can buy amps that sound faster and more detailed than the ML1.1s. You can also buy amps that will slam bass home with seismic force. And there are amps that offer greater power and dynamic reserves. But the ML1.1s offer more than a taste of these attributes while portraying music in ways that will draw you in and make high-end audio a truly participatory experience. Call it involvement or what you will -- it's hard to pin down with words but easy to hear when it's there. Perhaps the best way to convey the special musical nature of these amps is to say that I listened to a very wide array of recordings with them, and in every known digital format except MP3. Everything I threw at the ML1.1s was engaging though not made overly friendly, detailed but not in a mechanical way, and utterly human.

The Lamm ML1.1 is one of the great amplifiers you can buy, and an amplifier that will help audiophiles and civilians alike understand what high-end audio is about: the ability to be absorbed by the act of listening to music. The ML1.1s sound palpable and alive from the treble to the bass, with no region being highlighted. This imparts a sense of naturalness that few amplifiers can duplicate in one or two ways, let alone all of the ways the Lamms are able to reproduce the music. Their power output is great enough to drive a wide range of speakers.


Marc Mickelson, Soundstage.com (April, 2003)

...I can only reiterate what I said in my review of the original amplifier for TAS:  If 90W is...enough and you can afford the ticket, there may be no finer amplifier in the world. 

Paul Bolin, Stereophile (January, 2004)


For complete reviews, please visit our REVIEWS page