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Audio Research Manufacturer Model Comments

Audio Research Corporation

3900 Annapolis Lane North
Plymouth, Minnesota USA

www.audioresearch.com

S9 Preamp

Classic 60 Poweramp

Audiophile Recommended Component

Description
Hybrid tube/FET stereo power amplifier.

Links , Links

Condition is excellent and completly checked for sound and performance to be up to factory specifications.

Audio Research Preamp SP9 and Classic 60 Power amp

Preamp rear

Acoustic Research Inside

 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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