From this new info, I take it the best cable for me to use would be a decent coax like Bluejeans LC-1 with Taversoe RCA on one end and a switchcraft 1/4" mono on the other. The tip shaft on the Switchcraft units are solid OFC copper as well as the sleeve with a silver plate. The included adapters are very poorly made and are hollow and the weight suggests they are made of aluminum or something with gold plate. No way they are made of brass they are simply to light.

Solid-State