Audio Research I/50 Manuel utilisateur

You.Thank

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.

We understand you are eager to begin listening; however, please

take a few minutes to read through this guide for useful information

concerning the operation of your new integrated ampliﬁer. Once

installed, please allow an appropriate break-in period to fully appreciate

the sonic performance this integrated will provide to your system.

After reading the user guide, if you have any further questions regarding

your I/50, contact your dealer or Audio Research customer service - they

will be happy to help you make the most of your new component.

Happy Listening!

CONTENTS Safety

Warnings

Installation

Connections

Operation

Maintenance

Warranty

Speciﬁcations

Vacuum Tube Installation

Before operating the I/50

In your system

A note about vacuum tubes

Back Panel Connections

Input Connectors

Output Connectors

Headphone

Impedance Matching

Phono Module

AC Power Connection

Top Panel Controls

Remote Functions

Start Up

Shut Down

Break In

Rotary Control Knobs

Remote Control Functions

Phono Module

DAC Module

Vacuum Tubes

Servicing

Cleaning

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 sucient 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.

The 3 wavy lines symbol within an equilateral triangle is intended to alert the user to the presence of a hot surface on

the exterior case of the product.

• Read these instructions.

• Keep these instructions.

• Heed all warnings.

• Follow all instructions.

• Do not use this apparatus near water.

• Clean only with a soft, damp (not wet) cloth.

• Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

• Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including ampliﬁers) that produce

heat.

• Do not defeat the purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A

grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the

provided plug does not ﬁt into your outlet, consult an electrician for replacement of the obsolete outlet.

SAFETY

• Warning: The apparatus shall be connected to a mains socket outlet with a protective earthing connection.

• Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit

from the apparatus.

• Only use attachments/accessories speciﬁed by the manufacturer.

• Unplug this apparatus during lightning storms or when unused for long periods of time.

• Refer all servicing to qualiﬁed service personnel. Servicing is required when the apparatus has been damaged in any way, such as power

supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to

rain or moisture, does not operate normally, or has been dropped.

• WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.

• DO NOT EXPOSE THIS APARATUS TO DRIPPING OR SPLASHING AND THAT NO OBJECTS FILLED WITH LIQUIDS, SUCH AS VASES,

SHOULD NOT BE PLACED ON THE APPARATUS.

• TO COMPLETELY DISCONNECT THIS APPARATUS FROM THE AC MAINS, DISCONNECT THE POWER SUPPLY CORD FROM THE AC

RECEPTACLE.

• 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.

100-127V T5AL250V MDQ (ARC part 34600501)

220-240V T3.15AL250V (ARC part 34600301)

• Speaker terminal banana jacks are plugged/capped for units sold in countries where this is required due to power cord plug pin shape.

To prevent ﬁre, or shock hazard, do not expose your I/50 to rain or moisture.

Do not place objects containing liquids on top of this unit.

This unit contains voltages which can cause serious injury or death. Do not operate with covers removed. Refer servicing to your autho-

rized Audio Research dealer or other qualiﬁed personnel.

The detachable power cord on your I/50 is equipped with a heavy gauge, 3-conductor cable and a standard three-prong grounding plug.

For absolute protection, do not defeat the ground power plug. This provides power line grounding of the I/50 chassis to provide absolute

protection from electrical shock.

The appliance coupler (A.C. power connector) at the rear of this unit must be accessible for emergency power disconnect.

The power button on the front of this unit, when o, does not disconnect all power from this unit. This unit is in sleep mode when not on.

For continued protection against ﬁre hazard, replace the fuse only with the same type and rating as speciﬁed at the fuse holder (see page

19 for fuse information).

This unit is RoHS compliant.

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

necessary, or other occasion requiring shipment occurs, the original packaging will protect your I/50 from unnecessary damage or delay.

WARNINGS

INSTALLATION

V1 - V4

6550WE

V5 - V7

6922

VACUUM TUBE INSTALLATION

LexieTube®

Display

INSTALLATION

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. Proceed according to the following instructions.

Remove tube cover. Carefully remove each vacuum tube from its protective foam and match its location ‘V’ number (written on the base

of the tube) to the ‘V’ number printed next to each socket. Firmly seat each tube in its matching socket, taking care to ‘key’ the tube pins

to the socket holes. Retain the tube carton with other packing materials for possible future use.

Refasten tube cover on the I/50.

In your system

To ensure normal component life and safe operation this unit must be operated only in an upright position. Adequate airﬂow and proper

cooling can occur only if there is no restriction above and behind the unit and on either side.

The special non-marring elastomer feet provide adequate spacing and stability only on a smooth, hard surface, and also assist to isolate

the ampliﬁer from spurious vibrations. For upright stability and best performance, never operate the unit while it is sitting on a soft surface

such as a rug or carpet.

Due to its weight (40 lbs/18.1kg), this ampliﬁer must be supported on a surface speciﬁcally rated for such a load. Check with the

manufacturer of your support system to be sure it is rated to handle this weight.

If the unit is to be operated in an enclosure such as an equipment rack, make certain that adequate airﬂow above and to each side of

the unit is provided. Audio Research recommends a minimum of 6-8 inches (15-20 cm) of clearance above the I/50 to maintain proper

ambient operating temperature. It is not recommended to operate the I/50 in an enclosed cabinet.

The ‘ambient’ operating temperature should never exceed 120° F or 49° C. Improper installation will cause premature tube failure and will

aect your warranty, as well as the service life of the unit.

It is normal for a vacuum tube ampliﬁer to run quite warm, and if used for prolonged periods, hot to the touch. All components within are,

however, operated at safe, conservative levels and will not be improperly aected thereby, providing the requirements outlined above

are adhered to.

A 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.

These life expectancies are only approximate. The damper rings on the 6922 tubes may be reused.

Important: When replacing vacuum tubes, please seek assistance from your dealer or local service shop. The bias will need to be

readjusted for the new set of installed tubes.

INSTALLATION

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