Presonus Bluetube DP V2 - stereo dual path mic/instrument pre-amp, 2 input channels, each with: High-headroom Class A XMAX mic preamplifier with 80 dB gain range, 12AX7 vacuum tube gain stage, Tube Drive tube-saturation control, 48V phantom power, 80 Hz high-pass filter, -20 dB pad to reduce hot input levels, Polarity-reverse switch, Illuminated analog VU input-level meter, Input/Output: 2 balanced combo mic/unbalanced instrument inputs, 2 balanced XLR main (L/R) line outputs, 2 unbalanced 6,3mm main (L/R) line outputs, dimensions: Compact 1/2U chassis, External 12 VDC, 1A power supply