Used Audio Research Reference 3 preamp in excellent condition

Tube hours on 500 hours

Specifications:
FREQUENCY RESPONSE
+0 -3dB 0.2Hz to 200kHz at rated output. (BALANCED, 200k ohms load.)

DISTORTION (THD)
Less than .01% at 2V RMS Balanced output.

NOISE & HUM
2.7µV RMS residual IHF weighted balanced noise output with volume at 1 (106dB below 2V RMS output.)

GAIN
Main output (SE or BAL input): 11.6dB Balanced output, 5.6dB Single Ended output.
Tape output: 0dB.
(Processor input: 0dB Balanced.)

INPUT IMPEDANCE
120K ohms Balanced, 300K ohms SE

OUTPUT IMPEDANCE
600 ohms Balanced, 300 ohms SE main (2), 20K ohms minimum load and 2000pF maximum capacitance.

OUTPUT POLARITY
Non inverting

MAXIMUM INPUTS
20V RMS maximum Balanced, (10V RMS SE).

RATED OUTPUTS
2V RMS (1V RMS SE) into 200K ohm balanced load (maximum balanced output capability is 30V RMS at less than 0.5% THD at 1kHz).

POWER SUPPLIES
Electronically regulated low and high voltage supplies. Automatic 40 sec. warm-up/brown-out mute.
Line regulation better than .01%.

TUBE COMPLEMENT
(4) 6H30P plus (1 each) 6L6GC and 6H30P in power supply.

POWER REQUIREMENTS
100-135VAC 60Hz (200-270VAC 50/60Hz) 125 watts.

OTHER
Inputs (7): CD, TUNER, VIDEO, PHONO, AUX1, AUX2, PROCESSOR. (XLR and RCA connectors).
Outputs (3): 2 main, 1 tape (XLR and RCA connectors).
Controls: Volume (104 steps), Select Input.
Push Buttons: Power, Proc, BAL/SE, Mute.

DIMENSIONS
19" (48 cm) W x 7" (17.8 cm) H (standard panel) x 15½" (39.4 cm) D.
Handles extend 1 ½" (3.8 cm) forward of the front panel.

WEIGHT
29.6 lbs. (13.5 kg) Net; 43 lbs. (19.5 kg) Shipping.