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5

Warnings

To prevent fire, or shock hazard, 

do not expose your Reference 

250 SE to rain or moisture.

Do not place objects containing 

water 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 authorized Audio Research 

dealer or other qualified personnel.

The detachable power cord on your 

Reference 250 SE 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 Reference 250 SE 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.

For continued protection against fire hazard, 

replace the fuse only with the same type 

and rating as specified at the fuse holder. 

The power button on the front of this 

unit, when off, does 

not

 disconnect 

all power from this unit. This unit 

is in sleep mode when not on.

This unit is RoHS compliant.

A note about packaging... 

Save all packaging in a dry place away from 

fire hazard. Your Reference 250 SE 

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 Reference 250 SE 

from unnecessary damage or delay.

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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