GemTune GP-01 Hi-end Vaccum Tube Amplifier with 300BX2,6N8P/6H8CX2,5Z3P/5U4GX1 Pure Class A Single-end integrated amplifier; 300B tube upgraded to PSVANE brand Brief wiring & well designed lay out, to bring clean and refine sound and minimize noise Employs two 300B tubes which bring balanced, noble, extremely rich sound, and two 6N8P/6H8C tubes to strengthen the performance This tube amp is specially designed for the ones who are not satisfied with entry-level tube amp and seeking for a more exquisite and fat sound. To ptotect the amp,tube and machine are packed individually. Please download the user manual from:https://s3.amazonaws.com/Doctor-001/GemTune+Amp/GemTune+GP-01.pdf