Nº33H
MONAURAL POWER AMPLIFIER
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from input to output. These are taken from a
single 3.417 kVA custom transformer, using multi-
ple taps to maintain the symmetrical nature of the
two bipolar supplies. Since each amplifier is
monaural, you can count on symmetry at the
transformer for the noninverting and inverting
sides of the same signal. This stands in contrast to
“stereo” amplifiers which share a single trans-
former between dissimilar amplifier channels,
wherein crosstalk through the power supply pres-
ents problems.
Nº33H
MONAURAL POWER AMPLIFIER
Each monaural Nº33H weighs in at 175 pounds
(over 80 kg) and takes advantage of a vertically
oriented industrial design that reduces the floor
space the amplifier would otherwise require.
Rated at 150 watts into an 8-ohm-load, the Mark
Levinson Nº33H delivers extraordinary power to
the complex impedances of actual loudspeakers.
Each monaural amplifier chassis employs four
60,000 µF capacitors for a total of almost 1⁄4 Farad
of capacitance. A fully balanced power amplifier
from input to output, the Nº33H optimizes the
reproduction of today's finest sources. It achieves
common mode (noise) rejection in the loudspeak-
er's voice coil, protecting the entire portion of the
signal chain for which it is responsible from radiat-
ed and other forms of common mode noise.
AC Regeneration: One of the most significant
features of the Nº33H amplifiers is the presence of
the AC Regeneration system, which siphons off a
portion of the DC power from the main supply,
using it to power an oscillator circuit that gener-
ates pure sine wave AC. Having created this
absolutely clean AC source, we then rectify it,
filter it, and regulate it as you would expect in any
high quality power supply. But because the AC
power we began with was textbook-perfect, the
quality of the resulting DC for the sensitive
voltage gain stages is unrivaled. In effect, we
create our own small power utility for the purpos-
es of feeding the power supply of the voltage gain
Technical Background
Fully Balanced Power Supply: The Nº33H uses
two independent, bipolar power supplies to
support the fully balanced nature of the amplifier
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stages. The result is the purest possible power for
these sensitive stages.
other Mark Levinson amplifiers, will shut them-
selves down if they sense any of a number of fault
conditions which could cause damage to either
themselves or to the loudspeakers.
“Double” Balanced Voltage Gain Stages: The
incoming signal from the preamplifier is received
using a special topology that eliminates the
customary feedback point on the inverting side of
the first stage differential amplifier, providing for a
truly balanced impedance at this critical juncture.
The Sound
The clarity and dynamics of the Nº33H Monaural
Power Amplifier are quite stunning, particularly
to those intimately familiar with the finest elec-
tronics. Additionally, the subjective noise floor
seems to drop significantly, revealing myriad
details in the music and a sense of soundstaging
and imaging that is without peer. The Nº33H
provides all the power and authority of a large
amplifier design, while retaining the finesse of a
smaller audiophile power amp.
Fully Balanced Output Stage: A total of 40
output devices (in two sets of ten complementary
pairs) are used in a bridged configuration. Thus
the output terminals do not reference ground at
all, and the Nº33H achieves near-perfect symme-
try in output currents resulting in effortless
precision and power.
Summary
Adaptive Biasing System : This system refer-
ences both the instantaneous voltage and current
required by the load and determines the optimal
bias at each and every moment. This sophistica-
tion makes it impossible to reverse-bias the
outputs of any of the current Mark Levinson
amplifiers. This greatly reduces junction switch-
off transients and allows the amplifiers to achieve
the effortless, fatigue-free performance that Mark
Levinson amplifiers are known for.
The Nº33H Monaural Power Amplifier is the
absolute reference for audiophile listening. It
delivers effortless power in an elegant design that
conveys the entire musical experience. From the
subtlest nuance to the boldest crescendo, the
Nº33H will remind you why you fell in love with
music in the first place.
Exhaustive Listening Tests: Extensive listening
tests were conducted to evaluate every critical
component in the signal path. Hundreds of hours
were invested at every stage of the design to
ensure that we squeezed every last drop
of performance from the design of the
Nº33H.
Comprehensive Protection Circuitry:
The Nº33H power amplifier, as well as our
Custom designed toroidal power supply.
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Nº33H Monaural Power Amplifier
Rated power output:
150W/ch continuous rms power @ 8Ω
300W/ch continuous rms power @ 4Ω
The above power ratings measured as continuous (rms) power
from 20Hz–20kHz with no more than 0.3% THD (assuming that the AC mains can
deliver adequate current, without its own voltage sagging)
Frequency response:
within 0.2dB from 20Hz to 20kHz
Signal-to-noise ratio
(main outputs):
Voltage gain:
better than –80dB (ref. 1W)
26.8dB
Input impedance:
100kΩ (balanced)
50kΩ (single-ended)
Input sensitivity:
1.59V for full rated output
Output impedance:
Power consumption:
less than 0.05Ω from 20Hz–20kHz
typically 540 watts ( 5%) at idle
typically 210 watts ( 5%) in standby
Mains voltage:
100V, 120V, 220V, 230V, or 240V at either 50 or 60Hz, factory set for destination country
Connector complement:
(2) pairs custom binding posts
(1) balanced input on XLR
(1) single-ended input on Mark Levinson RCA
(1) 3.5mm trigger out jack
(1) 3.5mm trigger in jack
(1) RJ-45 communications port (Mark Levinson Linking™)
(1) RJ-11 communications port (Mark Levinson Linking™)
(1) captive high current AC mains cord
Overall dimensions:
Shipping weight:
width: 11"
height: 18.5" (47cm)
depth: 22.875" (58.1cm)
(27.94cm)
220lb (100kg) each
Specifications are subject to change without notice.
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Mark Levinson® is a registered trademark of
Harman International Industries, Incorporated.
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Not responsible for typographic errors.
Part # 072-17290
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