Moving in a different direction, so it's time to sell my Audio Research Ref 6 preamp. There are, of course, many great reviews of this fantastic preamp. It's in excellent condition, and I have the original remote and 12v trigger cord, as well as the original packing materials. I can't seem to locate the manual (though I know it's somewhere in my house), but I've printed out the manual from the Audio Research support site.
+0-3dB, 0.4Hz to 200kHz at rated output (Balanced, 200k ohms load).
Less than .01% at 2V RMS BAL output.
Main output: 12dB Balanced output, 6dB SE output. Record out: 0dB (Processor input: 0dB BAL output).
120K ohms Balanced, 60K ohms SE. Inputs: 4 balanced, 4 single-ended. Assignable processor passthrough.
600 ohms Balanced, 300 ohms SE Main (2). 20K ohms minimum load and 2000pF maximum capacitance. Outputs (3): 2 main, 1 record out (XLR and RCA connectors).
18V RMS BAL, 9V RMS SE.
2V RMS (1V RMS SE) into 200K ohm balanced load (maximum balanced output capability is 70V RMS at less than 0.5% THD at 1kHz).
-88dB or better at 1kHz and 10 kHz.
Rotary encoders: Volume (103 steps), Select Input. Push Buttons: Power, Menu, Enter, Mono, Invert, Mute.
Electronically regulated low and high voltage supplies. Automatic 45 sec. warm-up/brown-out mute. Line regulation better than .01%.
1.7uV RMS residual IHF weighted balanced equivalent input noise with volume at 1 (109dB below 2V RMS output.)
(6)-6H30P dual triodes, plus (1 each) 6550WE and 6H30P in power supply.
100-135VAC 60Hz (200-250VAC 50/60Hz) 130 watts. Standby: 2 watts.
Width: 19” (48 cm)
Height: 7.8” (19.8 cm)
Depth: 16.5” (41.9 cm)
Handles extend 1.6” (4 cm) forward of the front panel.
Weight: 37.5 lbs. (17 kg) Net; 49 lbs. (22.3 kg) Shipping