Audio Research I/50 Manual
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Audio Research I/50 Manual

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Summary of Contents for Audio Research I/50

  • Page 2 Thank You.
  • Page 3 Thank you for choosing the I/50 Integrated to be a part of your music listening system. Since 1970, Audio Research has been creating some of the world’s finest audio equipment. Each piece is handcrafted in Minnesota, and has been designed to provide many years of listening enjoyment.

  • Page 4: Table Of Contents

    CONTENTS Safety Warnings Installation Vacuum Tube Installation Before operating the I/50 In your system A note about vacuum tubes Connections Back Panel Connections Input Connectors Output Connectors Headphone Impedance Matching Phono Module AC Power Connection Operation Top Panel Controls Remote Functions...
  • Page 5 SAFETY The lightning flash with arrowhead symbol with 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 sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (service) instructions in the literature accompanying the product.
  • Page 6 • THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY ACCESSIBLE. • The user-replaceable rear panel fuse of the I/50 shall only be replaced with a fuse of the correct breaking capacity and voltage rating as specified below and on the rear panel of the amplifier.
  • Page 7 A note about packaging... Save all packaging in a dry place away from fire hazard. Your I/50 amplifier is a precision electronic instrument and should be properly cartoned any time shipment is made. You may not have occasion to return your unit to the factory for service, but if that should prove...
  • Page 8 INSTALLATION VACUUM TUBE INSTALLATION 6550WE 6922 LexieTube® Display...

  • Page 9: Before Operating The I/50

    Before operating the I/50 Your I/50 amplifier is shipped with the vacuum tubes packed in a separate foam-lined carton. These must be unpacked and installed before you attempt to operate the amplifier. Included are three 6922 tubes for the input and driver stages, and a matched pair of 6550WE for the amplification output stage.

  • Page 10: Note About Vacuum Tubes

    The vacuum tubes in your I/50 have been burned in, tested and electrically matched to provide the best performance and reliability of your amplifier. That said, vacuum tubes must be replaced from time to time. The 6922 tubes in the I/50 should have an expected life of approximately 4,000 hours, while the 6550WE tube in the power amplifier should have a life expectancy of approximately 2,000 hours.
  • Page 12 OUTPUTS Ω Ω Ω AUDIO MODULE SE3/ BALANCED AUDIO MODULE PASS Input 1 VOLTS Phono T5A (110V) Module T3.15 (230V) Module I/50 Ω Ω Ω VACUUM TUBE HIGH DEFINITION SERIAL INTEGRATED AMPLIFIER SLO-BLO OUTPUTS Analog Inputs Speaker Connections Power Connector...

  • Page 13: Input Connectors

    Input Connectors There are four analog inputs on the I/50: three single-ended (SE) and one balanced (XLR) pair(s). SE 1 is substituted with the phono module in the event it is installed. SE2 is a standard, single-ended input. ‘SE3/Pass’ is a dual function input, designed to work as a standard (volume controlled) input or a ‘pass thru’...

  • Page 14: Impedance Matching

    Phono Module When installed, the phono module replaces the ‘SE1’ input and is installed in the Audio Module port on the left side of the I/50 (adjacent the other analog inputs). The phono input is designed to accept moving magnet (MM) and high-output moving coil (MC) phono cartridges.

  • Page 15: Ac Power Connection

    On/Off control of the amplifier or the power switch on the remote control. The AC power source for the I/50 amplifier should be capable of supplying 15 amperes for 100 or 120 volt units, or 10 amperes for 220 or 240 volt units.

  • Page 16: Remote Functions

    OPERATION Top Panel Controls Remote Functions Power Direct Input Selection Display Mute Vol Up Functions* Vol Down Power Headphone Jack Input Volume LexieTube® Selector Mute Display *DAC Functions only work when the DAC module is installed.

  • Page 17: Start Up

    • If powering for the first time after connecting to an AC power source, the default state is input S1 and volume at 0. When turning the I/50 on from standby, the input will be set to the last used input.

  • Page 18: Rotary Control Knobs

    The left rotary knob selects input and allows entry into the phono control settings. The right rotary knob controls the volume. The volume range is from 1 to 45. Pressing down on the volume knob mutes and unmutes the I/50. When muted, the LexieTube® display will be dimmed.

  • Page 19: Phono Module

    The SE3/Pass input can be changed between a volume-controlled input like the other analog inputs, or as a pass-thru when using the I/50 with a secondary processor, such as a home theater processor with a volume control. To change between settings, press down and hold the ‘INPUT’...

  • Page 20: Servicing

    Vacuum Tubes It is recommended that you replace the vacuum tubes of your I/50 in sets. All of the tubes in your amplifier have been matched to have similar operating characteristics, to provide the best sound quality and reliability. 6550WE tubes should be replaced at approximately 2000 hours.

  • Page 21: Cleaning

    Cerakote finish. Cleaners containing abrasives should not be used as they may damage the finish of the I/50. A small, soft paintbrush is effective in removing dust from bevels, and other features of the front panel. Clean, compressed air can also be used to clean the fan and other hard-to-reach areas.

  • Page 22: Warranty

    In the unlikely event that technical service beyond the ability of the importer is required, Audio Research will fulfill the terms and conditions of the Limited Warranty. Such product must be returned at the purchaser’s expense to the Audio Research factory, along with a photocopy of the dated purchase receipt for the product, a written description of the problem(s) encountered, and any information necessary for return shipment.

  • Page 23: Specifications

    SPECIFICATIONS Power Output: 50 watts continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 1% per channel, below 0.1% at 1 watt (Note that actual power output is dependent upon both line voltage and “condition” i.e.: if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not critical) Power Bandwidth: (-3dB points) 10Hz to 22kHz Frequency Response: (-3dB points at 1 watt) 7Hz to 30kHz...
  • Page 24 ©2021 Audio Research Corporation. High Definition and LexieTubes are registered trademarks of Audio Specifications subject to change without notice. Research Corporation. Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation.

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