This is a set of two pieces of PCBof a stereo class A amplifier with ultimate sonic quality. The design is with reference to JC-3, a legendary design by John Curl, the long term partner of Mark Levinson. JC-3 was designed as a complementary power amplifier for JC-2, the most famous preamplifier in the solid state audio history. After John Curl's leaving of the company, JC-3 was never launched. JC-3 featured one of the most advanced solid state amplifier design at its time. Similar architecture can be found in John Curl's later design too. For a history of JC-3 please refer to https://www.marklev.com/JC3/index.html. PCB thickness 1.6mm. Gold-plated surface. PCB dimension 120mm x 84mm We do air shipping worldwide at US$7.00.