xDuoo MT-603 is an affordable and high-quality tube preamplifier. Based on a 12AU7 tube, it exhibits characteristic warm and spacious sound reproduction. It has 4 analog inputs: three in stereo RCA format and one in 3.5mm jack format on the front. Output is in RCA format. Four large buttons on the front panel allow you to simply select the active input. The components are built into a beautiful and durable aluminum alloy housing.