This is a very good sounding amplifier PCB, based on KSA GB150D. The schematic was recently released by the designer, and we were asked by some audiophiles to make the boards. So here are the long awaiting boards. While these are boards of our own, we try to adhere to the original component placement as to make the performance as optimize to original as we can. Partial kit with tight matching of some critical parts will be released later. This is a listing for TWO boards. Each board serves one audio channel. PCB dimension : 110mm x 55mm PCB thickness : 2mm Copper thickness : 75um( 4 times standard thickness) Surface finishing : Gold-plated with solder resist coated on both side for best reliability. We provide schematic and part list to buyers by EMAIL( to be attached to the shipment notice). We do air shipping worldwide at US$5.50.