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Operating Manual
®
Mark Levinson
Nº28
Preamplifier
Madrigal Audio Laboratories, Inc.
15
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WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of suffic
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Important safety instructions Please read all instructions and precautions carefully and completely before operating your Nº28 Preamplifier. 1. ALWAYS disconnect your entire system from the AC mains before connecting or disconnecting any cables, or when cleaning any component. 2. This product is equipped with a three-conductor AC mains power cord which includes an earth ground connection. To prevent shock hazard, all three connections must ALWAYS be used. If your electrical outlets will not acce
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® From all of us at Madrigal Audio Laboratories, thank you for choosing the Mark Levinson Nº28 Preamplifier. A great deal of effort went into the design and construction of this precision device. Used properly, it will give you many years of enjoyment. 18
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Table of contents Front panel ...................................................................................................1 Rear panel ...................................................................................................2 Unpacking and placement .......................................................................4 Unpacking .............................................................................................. 4 Placement ...........................................
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5 CD PHONO/ TUNER 4 6 AUX 1 MADRIGAL AUDIO LABORATORIES AUX 2 TAPE 1 3 7 TAPE 1 INPUT AUX 3 TAPE 2 Nº 28 TAPE 2 DEFEAT MONITOR 2 8 PREAMPLIFIER 9 1 10 OFF INPUT SELECTOR MONITOR SELECTOR RECORD SELECTOR OUTPUT LEVEL 1 2 3 4 Front panel 1 INPUT SELECTOR Selects one of the seven inputs: CD, TUNER, PHONO/AUX 1, AUX 2, AUX 3, TAPE 1, or TAPE 2. 2 RECORD SELECTOR Selects between the program source (selected via the INPUT SELECTOR), and either of two tape monitor inputs (selected via the MONITOR SELEC
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OUTPUTS INPUTS BALANCED MAIN POWER CD AUX 2 SUPPLY RIGHT LEFT RIGHT LEFT RIGHT LEFT INPUT LEFT PUSH PUSH PUSH PUSH GND RIGHT 7 4 2 8 6 5 3 1 Rear panel PRECAUTION Disconnect all associated equipment from the AC mains BEFORE making any signal connections and applying power to the Nº28. Note: All left-channel RCA-type inputs and outputs are at the top of the rear panel, and all right-channel RCA-type inputs and outputs are at the bottom of the rear panel. 1 PHONO/AUX 1 If your Nº28 is equipped wit
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Refer to the operating manual of your balanced-output line-level source to verify that the pin assignments of its output connector correspond to the Nº28. If not, wire the cable so that the appropriate output pin connects to the equivalent input pin. Note: If you won't be using the Nº28's balanced inputs and need more single-ended inputs, it's possible to fabricate a cable to connect line-level sources with single-ended output to these balanced inputs: Male RCA 1 Male XLR (connect to (connect to
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Unpacking and placement Unpacking Unpack your Nº28 Preamplifier and keep all packing materials for future transport. Locate and remove all accessory items from the cartons. Placement Carefully inspect the product for damage and flaws. If you find any, see your Mark Levinson dealer immediately. Place the Nº28 as close as possible to the source equipment, thus keeping interconnect cabling as short as possible. It may be placed on a shelf or in a cabinet where it's convenient to operate. A two-mete
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Voltage selection The PLS-228 is factory-set (internally) for 100V, 120V, 200V, 220V, or 240V AC mains operation @ 50 or 60Hz. Make sure that the label on the bottom of the PLS-228 indicates the correct AC operating voltage for your location. PLS-228 POWER SUPPLY PLS-228 bottom-panel label AC INPUT WARNING: BEFORE ATTEMPTING TO OPERATE THIS DEVICE, REFER TO OWNER'S MANUAL FOR PROPER OPERATING INSTRUCTIONS AND SAFETY PRECAUTIONS. HAZARDOUS VOLTAGE Voltage AVAILABLE INSIDE; DISCONNECT AC~ MAINS CA
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Set-up and installation Connectors and cables The Nº28 incorporates RCA-type and XLR-type connectors for audio signal input and output. The Madrigal-designed RCA-type connectors used for single-ended audio interconnection are a great improvement over ordinary RCA- type connectors. The gold-plated XLR-type connectors employed are of European design, and are made to professional application standards. When connecting the Nº28 to source equipment and power amplifiers, we recommend Madrigal Audio La
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Internal adjustments: The high-gain and low-gain phono options offer internally selectable cartridge loading cartridge loading via four single-pole miniature rocker switches, one for each channel. The high-gain and low-gain options have been factory-adjusted at 825Ω and 47KΩ , respectively. If you wish to change the factory-adjusted cartridge loading, see "Making the internal adjustments;" refer to the table below for the proper switch positions for each load setting. Cartridge loading settings
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Internal adjustments: If you wish to vary the input capacitance of the phono option to varying the input obtain the optimal value for a particular cartridge, a capacitor may capacitance also be inserted into the optional load terminals (see "Terminating the optional load" and "Making the internal adjustments"). Because the inherent input capacitance (all switches off) is in parallel with the optional load terminals, use the following formula to calculate the actual capacitor needed. C = C - C -
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Power connection and Be sure all associated equipment is disconnected from the AC mains. system activation After making all signal connections and internal adjustments, connect the ten-pin DC cable from the rear panel of the PLS-228 to the connector on the rear panel of the Nº28. Connect the AC cord to the male IEC connector on the rear panel of the PLS-228, then connect the AC cord to the AC mains. To PLS-228 To AC mains AC power cord polarity 1 = Line (hot) 1 2 1 2 2 = Neutral 3 = Earth ground
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Care and maintenance To remove dust from the cabinet of the Nº28, use a feather duster. To remove dirt and fingerprints, we recommend isopropyl alcohol and a soft cloth. 10
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Specifications The correlation between published specifications and sonic quality is unreliable. A list of numbers reveals virtually nothing. All technical measurements must be subject to qualitative as well as quantitative interpretation. Measurements of the Nº28 yield excellent results by any standards. However, only those specifications that apply to its actual operation are included here. Power consumption: 50W maximum, depending on options Mains voltage: 100V, 120V, 200V, 220V, or 240VA
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Dimensions 3/8" (9.5) 1/8" (3.2) Dimensions, Nº28, top view 1" (25.4) 3/4" dia. (19.1) 17-17/64" (438.6) 15-17/64" 17-1/2" (387.8) (444.5) 1-1/2" 7-1/2" (38.1) (190.5) 10-7/8" (276.3) Dimensions, Nº28, side view 2-9/16" 2-3/4" (65.1) (69.9) 7/16" 7/64" (11.1) (2.5) 12
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3/8" (9.5) 3/16" (4.8) Dimensions, PLS-228, 1-15/64" (31.4) top view 3/4" dia. (19.1) 8-3/16" (208.0) 8-35/64" 5-3/4" (217.1) (146.1) 1-55/64" 9-1/16" (47.2) (230.2) 13-1/8" (333.4) Dimensions, PLS-228, side view 2-39/64" 2-3/4" (66.3) (69.9) 7/16" 5/64" (11.1) (2.0) 13
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MADRIGAL AUDIO LABORATORIES 2081 South Main Street, P.O. Box 781 Middletown, Connecticut 06457 USA Telephone: (203) 346-0896 Fax: (203) 346-1540 ® is a registered trademark of Madrigal Audio Laboratories, Inc. 630080-2 ©1993 Madrigal Audio Laboratories, Inc. All rights reserved. Printed in U.S.A. 14
