xDuoo offers with its MT-603 an affordable and efficient tube preamplifier. Based on a 12AU7 tube, it reveals a characteristic warm and round sound reproduction. It is equipped with 4 analog inputs: three in stereo RCA format and one in 3.5mm jack format in front. The output is in RCA. Four large buttons on the front allow to simply select the active input. The components are integrated in a beautiful and robust aluminium alloy case.