product details:-  with original tube 6J1-  main filter capacitor using imported 1000UF / 35V, 1UF capacitor coupling capacitors imported-  Resistance selection Rings metal resistance 1%, ensure the machine a good signal to noise ratio.-  the PCB using 1.6mm thick double-sided sheet, 2.0 oz copper thickness, HASL whole process to ensure the size of the current through the good