The TD-100 instrument preamp and tube direct box from Summit Audio features a hybrid signal path utilizing both a discrete transistor input device and a 12AX7A vacuum tube to give your musical instruments the clarity of class A sound with the richness and warmth of vacuum tubes all in 1/2" rack space. This vacuum tube adds a subtle texture and smoothness, a professional sheen to your instrument, which is perfect for both live and studio use. The TD-100 offers both XLR microphone level and 1/4" TRS line level outputs, plus variable input impedance, polarity switch and ground lift, signal and overdrive LEDs, and even a headphone output for use as a practice device. See what a little Summit Audio can do for you.