Tube-Tech MP2A, 2 channel Tube based push-pull output amplifier, gain from +10 dB to +70 dB in 2 dB increments, pad in front of input transformer (-20 dB), built-in +48 V phantom power, overload indicator, microphone input impedance = 600 Ohms/ 1,2 kOhm/2,4 kOhm, CMRR >60 dB @ 10kHz, direct instrument jack-socket input for various instruments on the front, XLR inputs and outputs on the back, dI input impedance > 1 Mohm, frequency Response @ -3 dB: 5 Hz to 60 kHz, typical noise figure: 5 dB @ 200 Ohms, dimensions: 19" 2U