Audio Research Reference 250 Monoaural Amplifier

MINT CONDITION WORLD-CLASS MONOBLOCKS! (1 pair)

Sold with brand NEW set of factory tubes with less than 20 play hours.

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Specifications

• 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: 105-130V AC 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.

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