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Audio Research Reference 250 Power Amplifiers

ref250_lindsay_1236819355
Recently traded in and in fantastic condition. Complete with original boxes and accessories. Only 1100 hours on these beauties. They have SE lids on them, however, should you wish the badges can be removed.

Recently traded in and in fantastic condition. Complete with original boxes and accessories.

Only 1100 hours on these beauties.

They have SE lids on them, however, should you wish the badges can be removed.

Manufacturer Site Link: Audio Research

Brand: Audio ResearchAudio Research £ 9,800.00 each


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Recently traded in and in fantastic condition. Complete with original boxes and accessories.

Only 1100 hours on these beauties.

They have SE lids on them, however, should you wish the badges can be removed.

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.
Overall negative feedback 8.8dB
Damping factor Approximately 10
Distortion  
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.
Tube complement (3) Matched pairs 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).
Other  
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.