PreSonus BlueTube DP V2 2-channel Mic/Instrument Tube Preamp Dual path, with both 12AX7 vacuum tube and solid-state gain stages Combo mic/instrument inputs with Class A XMAX mic preamplifiers and 48V phantom power Tube Drive tube-saturation control Illuminated analog VU input-level meter 80 Hz high-pass filter, -20 dB pad, Polarity-reverse switch Compact 1/2U rack-mount chassis