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| Audio Research | Manufacturer | Model | Comments |
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Audio Research Corporation 3900 Annapolis Lane North www.audioresearch.com |
S9 Preamp Classic 60 Poweramp |
Audiophile Recommended Component Description Condition is excellent and completly checked for sound and performance to be up to factory specifications. |

Preamp rear






Specifications |
Power output 60 watts minimum continuous at 16 ohms from 15Hz to 20kHz with less than 1.0% THD (typically below .005% at 1 watt) Power bandwidth (-3dB points): 12Hz to 40kHz Frequency response Input sensitivity 550mV RMS for rated output Input impedance 100k ohms Output taps 4, 8, 16 ohms Output regulation Approximately 0.3dB, 16 ohm load to open circuit (equivalent to an output impedance of 0.56 ohms) Overall negative feedback 20dB Damping factor 30 Distortion Slew rate 20V/µs Rise time 2µs Hum & noise Less than 2.0mV RMS - 84dB below rated output (20kHz bandwidth, unweighted, inputs shorted) Power supply energy storage 280 joules Power requirements 105-125VAC 60Hz (210-250VAC 50Hz) 500W at rated output, 700W maximum, 370W at idle. Tube complement (4) MP6550, (4) 6FQ7/6CG7 Other Dimensions 19" (48 cm) W x 7" (18 cm) H x 15.75" (40 cm) D. Handles extend 1 5/8" (4.1 cm) forward of the front panel. Output connectors extend 1" behind rear panel.. Weight 63 lbs (28.64 kg) Net, 76 lbs. (34.55 kg) Shipping
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