This is an auction of the bare PCB of a 80W current dumping amplifier reference to the legendary Quad 405 amplifier. The current dumping technology is invented by Quad as an effort to remove the output transistor nonlinearity. Thousands of users of Quad 405 have reported the superb sonic performance of this classic amplifier. We provide schematic to the buyers by EMAIL. We do air shipping worldwide at US$5.00.