Warm Audio TB12 Tone Beast Retro LE; 1-channel microphone and instrument preamp;Limited Edition; up to 71dB gain; Transformer Bypass switch; two different discrete OpAmps: 1731 (Vintage) and 918 (Cleaner); Tone switch - switches the input impedance from 600Ohm to 150Ohm; Hi-Z input sends the signal through the complete circuit; Balanced outputs: XLR and 6.3mm jack; Insert: 6.3mm jack; 48V phantom power; design: 19" 1HE