Using the 6J9 tube, USB decoding uses PCM2706 chip.The main filter capacitor uses the imported electrolytic capacitor, and the coupling capacitor uses the imported Weimar capacitor 3.9UF.The resistor uses a five-ring 1% metal resistor to ensure a good signal-to-noise ratio.The PCB adopts 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and the whole process of tin-spraying ensures the good passing performance of the current.Input and output with gold-plated RCA lotus seatUse an all-aluminum chassisSpecifications:Working power supply: DC12V2AColour:blackMaterial:Aluminum alloyPackage Contents:1 * Vacuum Tube AmplifierOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.