I just re-read the PCA description , as I recalled them as being pure copper ("PCA" stood for "Pure Copper Audio"). The description on the site talks a lot about silver cables in general, but doesn't identify the PCA as being silver - in fact, the final part of the statement refers to the possibility of making silver cables at some point in the future. I'm pretty certain that the PCA has always been a copper cable.

Based on that last statement, I'm pretty sure the description pre-dates the release of the PSC ("Pure Silver Coax") cables that are intended for video and coaxial digital audio applications. The PSC is a silver cable.