Limited Warranty; Specifications - Audio Research Reference 250 Owner's Manual

Limited Warranty

Audio Research Corporation products are
covered by a 3-Year Limited Warranty or a
90-Day Limited Warranty (vacuum tubes).
This Limited Warranty initiates from the date
of purchase, and is limited to the original
purchaser, or in the case of demonstration
equipment, limited to the balance of
warranty remaining after original shipment
to the retailer or importer.
In the United States, the specific terms,
conditions and remedies for fulfillment of this
Limited Warranty are listed on the warranty
card accompanying the product in its
shipping carton, or may be obtained from
the authorized retailer or from the Audio
Research Customer Service Department.
Outside the United States, the authorized
importing retailer or
accepted the responsibility for warranty of
Audio Research products sold by them. The
specific terms and remedies for fulfillment of
the Limited Warranty may vary from country
to country. Warranty
normally be obtained from the importing
retailer or distributor from whom the product
was purchased.
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
encountered, and
necessary for return shipment. The cost of
return shipment is the responsibility of the
purchaser.
9
distributor has
service should
the problem(s)
any information

Specifications

POWER OUTPUT: 250
continuous from 20Hz to 20kHz. 1kHz total
harmonic distortion typically 0.5% at 250 watts,
below .04% at 1 watt.
power available at "clipping" 270 watts (1kHz).
(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 very critical.)
POWER BANDWIDTH: (-3dB points) 5Hz to 70kHz.
FREQUENCY RESPONSE: (-3dB points at 1 watt)
0.5Hz to 110 kHz.
INPUT SENSITIVITY: 2.4V RMS Balanced for rated
output. (25.5 dB gain into 8 ohms.)
INPUT IMPEDANCE: 200K ohms Balanced.
OUTPUT TAPS: 4, 8, 16 ohms.
OUTPUT REGULATION: Approximately 0.9dB 16
ohm load to open circuit (Damping factor
approximately 10).
OVERALL NEGATIVE FEEDBACK: 8.8dB.
SLEW RATE: 20 volts/microsecond.
RISE TIME: 1.5 microseconds.
HUM & NOISE: Less than 0.2mV RMS – 110dB
below rated output (IHF-A weighted, input
shorted, 16 ohm output).
POWER SUPPLY ENERGY STORAGE: Approximately
900 joules.
POWER REQUIREMENTS: 105-130VAC 60Hz (260-
250VAC 50Hz) 770 watts at rated output, 1000
watts maximum, 380 watts at "idle," 1 watt off.
TUBES REQUIRED: 3 Matched pair KT120 (Power
output V1-6); 1 Matched pair KT120 (Driver V8-
9); 2 6H30 (Gain stage V7 and Regulator Driver
V10); 1 6550C (Regulator V11).
DIMENSIONS: 19" (48.3 cm) W x 8.75" (22.2 cm) H x
19.5" (49.5 cm) D. Handles extend 1.5" (3.8 cm)
forward.
WEIGHT: 73 lbs. (33.2 kg) Net; 88 lbs. (40 kg)
Shipping.
Specifications subject to change without notice.
©2011 Audio Research Corporation.
watts per channel
Approximate actual