these are the technical features of the AR ref6 pre;
Frequency response: +0-3dB, 0.4Hz to 200kHz at rated output (balanced, 200k ohms load)
Distortion: Less than .01% at 2V RMS BAL output
Crosstalk: -88dB or better at 1kHz and 10kHz
Gain: Main output: 12dB balanced output, 6dB SE output. Record out: 0dB (processor input: 0dB balanced output)
Input impedance: 120kohms balanced, 60kohms SE. Inputs: 4 balanced, 4 single-ended. Assignable processor pass-through
Output impedance: 600 ohms balanced, 300 ohms SE Main (2). 20kohms minimum load and 2000pF maximum capacitance
Inputs: 4 × XLR, 4 × RCA
Outputs: 2 × main, 1 × record out (XLR and RCA connectors)
Output polarity: Non-inverting
Tube complement: 6 × 6H30P dual triodes, plus 1 × 6550WE & 1 × 6H30P in power supply
Dimensions (WHD): 480 × 198 × 419mm