Features: 12AU7 Tube Pre-amplifier, MT-603 adopts 12AU7 tube for pre-amp. Processed by the tube, the sound is sweet and soft Multiple Audio Inputs, MT-603 owns 4 audio inputs and one audio output. With 4 audio input ports, which inputs can be selected through the switch, and different audio inputs can be switched at any time to experience different fun; TONELUCK switch;Gold-plated RCA port, MT-603 is equipped with TONELUCK switch, which is durable and provides an excellent hand feeling.  The RCA port adopts a Gold-plated design, attractive and durable; Professional Capacitors, MT-603 adopts the special capacitance as the coupling capacitance to present have transparent and sweet sound, to reach smooth and warm sound, and high frequency; Matte Surface, Aluminum Alloy Shell, MT-603 is more than its amazing features, it is exquisitely built as well. Follow the modern minimalism design, it’s crafted with a simple elegant look with a sandblasted texture panel, made of solid aluminum alloy, which also can effectively resist external interference. You will truly explore the beauty of it when you hold it and enjoy HiFi music; Power Supply: DC12V/2A; Frequency Response: 10HZ~40KHZ(±0.5DB); THD+N: 0.01%; Gain:0DB; S/N:100DB; Size:12 x 7.8 x 4cm; Weight:360g; Package Included: 1 xAmplifier