TUBE POWER AMPLIFIER
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:
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.
two handles on the rear to make it easier to handle the amps and
protect the rear panel connectors during transportation
speaker binding posts
of better quality parts and materials that have become available
in recent years
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.
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
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
the output stage operation and simplify the replacement, if need be,
of the output tubes.
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.
ML1.1 works on all world AC line voltages (100/120/220/230/240V).
is what the prominent audio critics have said about the ML1.1
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
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.
Mickelson, Soundstage.com (April, 2003)
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
Stereophile (January, 2004)
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