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ML2.1 Amplifier

Sold as a set of Two Units (one pair)

ML2.1 is the direct replacement of the ML2 — the first in a line of LAMM single-ended amplifiers with a regulated power supply that represented a new generation of power amplifiers employing unique high current low impedance power vacuum tube triodes (6C33C) in both the output stage and voltage regulator. 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 ML2.1 features the following upgrades and modifications as compared to the ML2:

  • addition of a more user-friendly mains fuse holder.

  • power transformer upgraded to accommodate the 230V mains operation (in addition to the already existing 100/120/220/240V in the ML2)

  • 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 a much higher quality pc-board, and parts and materials that have become available in recent years

Chosen by the Design and Engineering Committee as one of the most innovative products of the year in the “specialty audio” category, the ML2 was a first single-ended amplifier on the market capable of reproducing a full range of audio frequencies and recreating the original spectral balance and harmonic structure of the recorded material with almost 100% accuracy. Another unique aspect of the design enables the ML2.1 to recreate a three-dimensional soundstage without boundaries and limitations while maintaining the extraordinary transparency of perceived sound.

A custom-designed output transformer, along with a unique output stage and high-current regulated power supply, allow the ML2.1 to drive most of the real world speakers and yield tremendous sonic stability under most dynamic conditions. Although the ML2.1s can drive most speakers, their full potential is realized in tandem with high efficiency speakers (94 dB and higher).

Two multi-turn trimming potentiometers accessible through special openings in the amplifier’s chassis, along with two sets of test points, allow the user to adjust and measure the nominal value of plate voltage and plate current of the output tube by using an external voltmeter.

In conceiving and executing an overall design of the ML2, 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; ELECTROCUBE and ROEDERSTEIN film capacitors; high frequency switching grade CORNELL DUBILIER and UNITED CHEMI-CON electrolytic capacitors; HAMMOND chokes; gold-plated NEUTRIC XLR connectors; and 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 which 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 ML2.1 works on all world AC line voltages.

U.S. Patent pending.

Critic Reviews & Press


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Reviewers' Choice

Soundstage! Magazine
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Editors' Choice Award

The Absolute Sound!
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October 2004 - October 2007

Class A

Class A for tube power amplifiers in the Recommended Components section
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December 2004

ML2.1 is listed in Products of the Year category, as a runner-up in both “2004 Amplification Component” (p. 61) and “2004 Joint Products of the Year” sections (posted 12/06/04).
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Recommended Component

Revue du Son
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Editors' Choice Award

The Absolute Sound!

Service & Support

Complementary Equipment

Compatible Discontinued Products:

Only one of the above products is required for a system

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