Professional vacuum tube channel strip is a silver Avalon Design Vt-737sp model. It has a Class A preamp, opto-compressor, and four-band equalizer. The front panel features a large analog VU meter, multiple control knobs for gain, threshold, compression, and EQ settings, and illuminated buttons for various functions. The unit is rack-mountable with a metal chassis and includes a rear-mounted heat sink and power connection. Excellent condition.