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15

Maintenance

Vacuum Tubes

It is recommended that you replace the 

vacuum tubes of your Reference 250 SE 

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. In the 

event you need to replace a single output 

tube, please refer to the numbers written 

on the silver base at the bottom of the 

vacuum tube when placing an order. 

Servicing

Because of its careful design and 

exacting standards of manufacture, 

your Reference 250 SE amplifier should 

normally require only minimal service to 

maintain its high level of performance.

Caution

Your Reference 250 SE amplifier contains 

sufficient levels of voltage and current to 

be lethal. Do not tamper with a component 

or part inside the unit. Even with the power 

turned off, a charge remains in the energy 

storage capacitors for some time. Refer any 

needed service to your authorized Audio 

Research dealer or other  

qualified technician. Additional questions 

regarding the operation, maintenance or 

servicing of your amplifier, please contact 

the Customer Support Department of 

Audio Research Corporation at  

[email protected] or 

call 763-577-9700. You may also 

initiate a service request by visiting 

the Audio Research website

(www.audioresearch.com) and 

selecting ‘Service Repair’ at the 

top right of the home page. 

Cleaning

To maintain the new appearance of this 

amplifier, occasionally wipe the front 

panel and top cover with a soft, damp 

(not wet) cloth to remove dust. A mild, 

non-alkaline soap solution may be used to 

remove fingerprints or similar smudges. 

Cleaners containing abrasives should not 

be used as they will damage the anodized 

finish of the front panel. A small, soft 

paintbrush is effective in removing dust 

from bevels, the recessed nameplate 

and other features of the front panel.

Disposal and Recycling Guidelines

To dispose of this electronic 

product, do not place in landfill.  In 

accordance with the European Union 

Waste Electrical and Electronic Equipment 

(WEEE) directive effective August 2005, 

this product may contain regulated 

materials which upon disposal require 

special reuse and recycling processing.  

Please contact your dealer or importing 

distributor for instructions on proper 

disposal of this product in your country. 

Or, contact Audio Research Corporation 

(763.577.9700) for the name of your 

importing distributor and how to contact 

them. Packing and shipping materials 

may be disposed of in a normal manner.

Содержание Reference 250 SE

Страница 1: ...Reference 250 SE H I G H D E F I N I T I O N...

Страница 2: ......

Страница 3: ...ou 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 amplifier Once installed please allow an approp...

Страница 4: ...t Connectors Matching Remote Turn on A C Power Connection 5 6 7 8 9 9 9 10 11 Operation Front Panel Controls and Displays Start Up Shut Down Display Brightness Adjustment Fan Meter Break in Output Tub...

Страница 5: ...hock The appliance coupler a c power connector at the rear of this unit must be accessible for emergency power disconnect For continued protection against fire hazard replace the fuse only with the sa...

Страница 6: ...tor Proceed according to the following instructions Installation Remove all screws fastening the top cover Carefully remove each vacuum tube from its protective foam and match its location V number wr...

Страница 7: ...Due to its weight 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 t...

Страница 8: ...PER SPEAKER CONNECTIONS SEE OWNERS MANUAL WARNING TO PREVENT FIRE AND SHOCK HAZARD DO NOT EXPOSE THIS DEVICE TO RAIN OR MOISTURE UNIT MUST BE OPERATED IN A HORIZONTAL POSITION DO NOT OPERATE WITH COVE...

Страница 9: ...on In the case of speaker systems with significant variations in impedance throughout the frequency spectrum such as most electrostatic types determine the best impedance match empirically for best ov...

Страница 10: ...2V IN jack on the rear of the Reference 250 SE The 12V IN jack should be connected to the 12V DC output of the master control system using a continuous 12V DC signal at 12mA per Reference 250 SE for t...

Страница 11: ...ge the loudspeakers Good operating practice dictates that the amplifier should be turned on last and turned off first in an audio system The Reference 250 SE uses a grounding system that does not requ...

Страница 12: ...ION FAN LIGHT POWER BIAS METER V1 V3 V5 V6 V4 V2 SET SET CHECK CHECK R Panel output and bias meter Main Power Switch Fan Speed Operation Front Panel Controls and Displays Display Brightness Bias Opera...

Страница 13: ...has no impact on sound quality when turned on The display brightness has three settings high low and off To change the brightness of the display locate the front panel button labeled Light Press this...

Страница 14: ...ch again to check V3 tube bias level which should be within the bias range arc Press the BIAS switch again and check the V5 tube bias level in the same way Note that the V3 and V5 tube bias levels are...

Страница 15: ...ation at service audioresearch com or call 763 577 9700 You may also initiate a service request by visiting the Audio Research website www audioresearch com and selecting Service Repair at the top rig...

Страница 16: ...the United States the authorized importing retailer or distributor has accepted the responsibility for warranty of Audio Research products sold by them The specific terms and remedies for fulfillment...

Страница 17: ...ut Polarity Non inverting Balanced input pin 2 IEC 268 Output Taps 16 ohms 8 ohms 4 ohms Output Regulation Approximately 0 9dB 16 ohm load to open circuit Damping factor approximately 10 Overall Negat...

Страница 18: ...15 Audio Research Corporation Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation H I G H D E F I N I T I O N 3900 Annapolis L...

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