Audio Research Ref 250 Monos (with Original Box)-KT150-SOLD!

by **vintageguys** Tue Jun 30, 2015 6:05 pm

Selling one pair Audio Research Ref 250 Monos-KT150

The concept of a large monoblock amplifier is to provide control to a speaker. The difficult part of the job is maintaining finesse and musicality while doing it. Audio Research has produced some of the most critically acclaimed products during its 42-year history and the new Reference 250 aims to break new ground.
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
240VAC 50Hz 770 watts at rated output, 1000 watts maximum, 380 watts at "idle," 1 watt off.
TUBES REQUIRED
Using KT150 (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.

Asking : SOLD!

Please call / whatsapp 016 800 8896 Mr Tan for more info.

GOOD LUCK!

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