SM Pro Audio TB202 Mikrofonski preamp 

The TB202 "Red Valve" series from SM Pro Audio is a two channel, tube (12AX7) microphone preamp that features switchable phantom power, phase reverse, a -20dB pad, optical compressor and fully functional EQ, all housed in a single 1U rack mount sized chassis.

Tailored for use in a home or project studio, the unit is perfectly suited as the front end for a digital audio recorder or workstation, or any other application that requires instrument or microphone preamplification.