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Audio Research Reference 250SE Mono Power Amplifiers

ref250se
The Reference 250 features new enhancements outside as well as major performance advances inside. First, you will notice a more modern, monochromatic appearance, including a new front panel with a small aluminum power button. ...Read more

The Reference 250 features new enhancements outside as well as major performance advances inside. First, you will notice a more modern, monochromatic appearance, including a new front panel with a small aluminum power button.

Manufacturer Site Link: Audio Research

Brand: Audio ResearchAudio Research Call 01483 537577 for Price


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An analog meter with adjustable illumination is set in the front panel is capable of displaying power output and tube bias settings. A new low turbulence fan provide effective yet silent cooling. Internally, the Reference 250 is outfitted with the KT120 output tubes and a bulk power supply 50 percent larger than its predecessor. Connections include accommodation for 4, 8 or 16 ohm speakers, an XLR input as well as 12 volt trigger connections.

Visually understated and sonically breathtaking, the Reference 250 is unmistakably Audio Research.

Brand URL : http://audio-research.com
POWER OUTPUT
250 watts per channel continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 0.5% at 250 watts, below .04% at 1 watt. Approximate actual 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 KT150 (Power output V1-6); 1 Matched pair KT150 (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
73lb or 33,2kg Net; 88 lbs. (40 kg) Shipping.