Lamm Industries ML-2.1

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.

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

I am the second owner of these amps. I purchased them in 2009 from the authorised Lamm Dealer in Sweden, they are 230v monoblocks but can easily be converted to 110v by changing the fuse at the back of the amps. I have had no issues with them and will include an extra set of new valves purchased from Lamm Industries. I will also include a Fluke 87 Series 5 Multimeter as you need to set the plate voltages very precisely. The amps come with all the original packaging, manuals etc. The lettering on the one amp valve fitting is slightly damaged (see picture) other than that the amps are is very good condition.