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Owner’s Manual
Nº33H
Monaural
Power Amplifier
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Important Safety Instructions 1. Read these instructions. 2. Keep these instructions. 3. Heed all warnings. 4. Follow all instructions. 5. Do not use this apparatus near water. 6. Clean only with a dry cloth. 7. Do not block ventilation openings. Install in accordance with the manufacturer’s instructions. 8. Do not install near any heat sources such as radiators, heat registers, stoves, or another apparatus that produces heat. 9. Do not defeat the safety purpose of the polarized or grounding-typ
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FCC Notice This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that inte
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Documentation Conventions This document contains general safety, installation, and operation instructions for the Nº33H Power Amplifier. It is important to read this document before attempting to use these components. Pay particular attention to safety instructions. Appears on the component to indicate the presence of uninsulated, dangerous voltages inside the enclosure – voltages that may be sufficient to constitute a risk of shock. Appears on the component to indicate important operation and m
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Table of Contents Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Opening the Shipping Crate . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 Moving the Nº33H . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Product Registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . .4 Placement . . . . . . . . . . . . . . . . . . . . .
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Unpacking Warning! DO NOT attempt to lift or move the Nº33H without adequate assistance. Failure to follow the procedures included in this owner’s manual may result in personal injury and/or product damage. The shipping weight of each Nº33H Monaural Power Amplifier is approximately 220 pounds (100 kg). To avoid injury, handle the Nº33H with extreme care. At least two strong people are required to unpack the Nº33H amplifier from its shipping crate. Two pair of knit, white gloves with special gri
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4. Use a socket wrench to remove: • The four 9/16-inch hexagonal-head bolts that secure the Nº33H to the base of the crate. These bolts attach directly to the bottom of the Nº33H’s feet and are accessible underneath the pallet on which the Nº33H sits. • The two 9/16-inch hexagonal-head bolts that hold the retaining bar in place. Moving the Nº33H Please read and understand these instructions before attempting to move the Nº33H from the shipping crate base. Note: Protect delicate floor surfaces be
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Installation Considerations The Nº33H requires special care during installation to ensure optimal performance. Pay particular attention to the information included in this section. Placement Your Mark Levinson Nº33H Monaural Power Amplifiers are specifi- cally designed to stand on the floor, and must be used as free- standing units. In most installations, locating them near the loud- speakers is best. Obviously, this approach minimizes the length of the speaker wires and necessitates longer inte
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• DO NOT place the Nº33H on a thick rug or carpet or cover the Nº33H with a cloth, as this might prevent proper cooling. • DO NOT expose the Nº33H to high temperatures, humidity, steam, smoke, dampness, or excessive dust. Avoid installing the Nº33H near radiators and other heat-producing appliances. Note Each Nº33H dissipates about 360 watts of heat energy when idle; it is normal and safe for it to run warm. Power Requirements When shipped, the Nº33H is configured for 100V, 120V, 220V, 230V or
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Note Building regulations and electrical codes differ from location to location, making it impossible to anticipate the require- ments of high-current AC circuits such as the Nº33H. Contact a local, licensed electrician for information. Warm-up & Break-in Although the Nº33H delivers superior performance from the Period first time it is powered on, this performance will continue to improve as various components “break in.” You should notice the greatest performance improvements within the first
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Special Design Features While the Nº33H Monaural Power Amplifier is straightforward in everyday use, it includes several design features that are responsi- ble for its outstanding performance. In particular, it defies the accepted wisdom that it is impossible to design a large, powerful amplifier that also has all the finesse of the finest smaller ampli- fiers. Massive Power Supply The Nº33H features a 3.47 kVA low-noise toroidal transformer in a fully balanced power supply—a design that provide
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Fully Balanced Design A truly balanced input topology eliminates the need for an input buffer amplification stage, allowing the first stage differential amplifier to be driven directly by the source. Matched impedances are presented to the source and both signals travel through identical circuit paths. Meticulous attention to the layout of the amplifier, including careful mirror-imaging of circuits to cancel magnetic fields, was essential to minimize magnetic field distortions that can occur wi
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cycle the amplifier with the ~ac mains relay switch on the rear panel. In addition, the AC input to each transformer is fused to protect against excessive current conditions such as driving shorted outputs. In-rush limiting prevents premature aging of power supply components during power-up, and switches to off-line once the power supply has been charged. Finally, the Nº33H incorporates a controlled clipping circuit that prevents output devices from saturating. The harsh high-frequency harmonics
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Front Panel 2 REFERENCE MONAURAL AMPLIFIER Nº 33H 1 1. standby button When power is first applied to the Nº33H power amplifier, and 10 assuming the rear panel AC mains switch is set to its on posi- tion, the amplifier remains completely off. Press the front panel standby button to bring the amplifier from completely off to standby. Each time you subsequently press the standby button (after a delay of ten seconds to allow all circuitry to sta- bilize), the Nº33H is toggled between standby mode an
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Rear Panel 3 4 balanced single ended inputs CAUTION ATTENTION RISK OF ELECTRIC SHOCK RISQUE DE CHOC ELECTRIQUE DO NOT OPEN NE PAS OUVRIR This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. MONAURAL POWER AMPLIFIER Nº 33H C US communication por ts slave out slave in remote tur
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2. ~ac mains relay switch The AC mains switch turns the amplifier completely off by disconnecting the supervisory power supply from the AC mains. Since this small supervisory supply controls the main power supply access to AC power, shutting down the supervi- sory power supply also disconnects the main supply from AC. 3. balanced input Receives balanced audio input from the associated preamplifier. One XLR connector is available. For best performance, use balanced connections whenever possible.
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5. loudspeaker binding posts (outputs) Provide audio output. Two pair of custom-made, gold-plated, high-current binding posts labeled + (positive) and – (nega- tive) are included. Positive binding posts are red; negative binding posts are black. These binding posts are designed to facilitate high pressure, high contact area connections without the use of tools such as nut drivers. A simple finger-tightening actually yields higher contact pressure than traditional hex binding posts. There is no n
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6. slave in & slave out communication ports Provide “links” to compatible Mark Levinson preamplifiers and power amplifiers, allowing the Nº33H and linked preamplifiers or power amplifiers to share Link controls. Two 6-pin modular RJ-11 jacks labeled slave in and slave out are available. The slave in communication port can be connected to a compatible Mark Levinson preamplifier that offers Link or communication ports. The slave out communication ports can be connected to a compatible Mark Levins
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Linking Linking is available for all Mark Levinson components that offer Link or communication ports, including master, slave in, slave out, , input, and control communication ports. These communication ports can be used to “link” compatible Mark Levinson components in a slave chain, allowing them to share Link controls. The Nº33H offers two Link communication ports labeled slave in and slave out. The slave in communication port can be connected to a compatible Mark Levinson preamplifier that of
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Constructing Link Link communication cables can be constructed using an Communication Cables 8-conductor modular telephone cable with the appropriate plug crimped on each end. • Use an 8-pin RJ-45 plug when connecting to a preamplifier. RJ-45 plugs provide an 8-pin connection. • Use a 6-pin RJ-11 plug when connecting to a power amplifier. RJ-11 plugs provide a 6-pin connection in which connector pins 7 and 8 are not used. Note BEFORE making Link connections, refer to the appropriate documentatio
