SPECIFICATIONS11Vacuum Tubes: 1 x 12AX7LPS, 1 x 6414 per channelFrequency Response 20 Hz - 60 KHz ( +/- 1 dB)THD .05% @ 1kHz, +4 dBv outSignal to Noise Ratio 80 dB or better typicaldepends on settings and tubesMaximum Output +32 dBv ( 70 volts RMS ! )+15 dBm into 600 ΩMaximum Input 450 mV with maximum gain settings.The Input Attenuator is before the tubes so normalmaximum input is much higher.Gain 40 to 60 dB maximum gain dependingon the setting of the GAIN SWITCHInput Impedance 2400 Ohm, transformer coupledoptimised for mics with 100 to 600 ohm outputimpedances.300 KΩ 1/4 direct inputOutput Impedance 50 ohms (from 20 Hz to 20 kHz)best driving 10 KΩ or higherwill drive 600Ω input with less headroomTransformer coupled balanced outputMULTI CAP™coupled unbalanced outputPower Consumption 18 WattsSize 19" X 1.75" X 10" (1U)Shipping Weight 12 lbs