This is a set of two pieces of PCB of a stereo class A amplifier with ultra-fi sonic quality. The design is with reference to the legendary design by Jean Hiraga published in L'Audiophile. This amplifier is the "Hiraga super 30W class A". With good heat dissipation, this amplifier can deliver 30W(+/-24V DC) of pure class A amplification. Features : This is our updated and improved version. The low level section is constant current loaded, and fed by good-sounding Kubota regulator. In bench test and listening test, the amplifier has substantial improvement in high frequency response. The noise and distortion is substantially lower. Sonically it has far better transparency than the original design. We provide schematics and part list for the buyers by EMAIL. We also provide heavy duty power supply boards that diyers can put in their favorite filtering electrolytic capacitors. Please check our other auctions. PCB thickness : 1.6mm. PCB dimension : 90mm x 97mm Copper Thickness : 75um ( four times normal thickness !!) tin-plated. Finishing : Double-sided tracks, double-sided solder resist coating for best reliability. The assembled board is for reference. This listing is for two pieces of bare amplifier PCBs. We do air shipping worldwide at US$6.00. We welcome combine shipping. Powered by SoldEazy