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.

Technical Background

Fully Balanced Power Supply: The Nº33H uses two independent, bipolar power supplies to support the fully balanced nature of the amplifier

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.

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

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Mark Levinson No. 33H manual Nº33H, Technical Background
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No. 33H specifications

The Mark Levinson No. 33H is a high-end audio amplifier designed to deliver unparalleled sound quality and performance. Renowned in the audiophile community, this amplifier exemplifies the convergence of cutting-edge technology, superior craftsmanship, and obsessive attention to detail. With a power output of 300 watts per channel into 8 ohms, and a remarkable 600 watts into 4 ohms, the No. 33H is engineered to drive even the most demanding loudspeakers with authority and finesse.

One of the standout features of the Mark Levinson No. 33H is its dual-mono architecture. This design isolates the left and right channels to eliminate crosstalk and ensure that each channel operates without interference. This meticulous attention to channel separation results in an expansive soundstage, where each instrument and vocal is rendered with crystal clarity and precision.

The use of proprietary technologies is another defining characteristic of the No. 33H. The amplifier employs a sophisticated linear power supply that utilizes a toroidal transformer to deliver consistent and stable power to the output stage. This not only enhances the amp’s performance but also minimizes noise and distortion, allowing for a more immersive listening experience. Additionally, the No. 33H incorporates advanced Class AB topology, blending the best qualities of both Class A and Class B amplifiers, providing rich, warm sound while maintaining dynamic efficiency.

The No. 33H is also equipped with a unique heat management system. The amplifier features extensive heatsinking and an intelligent thermal monitoring system to ensure optimal performance without overheating. This ensures longevity and reliability in even the most demanding listening scenarios.

Further enhancing its luxury appeal, the Mark Levinson No. 33H is finished in a striking chassis, crafted from high-quality materials that convey elegance and sophistication. An intuitive control interface allows users easy access to various features and settings, making the listening experience both enjoyable and customizable.

With its impeccable build quality, cutting-edge technologies, and commitment to achieving sonic excellence, the Mark Levinson No. 33H stands as a testament to the brand's legacy in high-fidelity audio. Whether in a home theater setup or a dedicated listening room, the No. 33H delivers a performance that is nothing short of extraordinary, making it a worthy investment for any serious audiophile.
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