My trial RCA-RCA patch cable. Both the wire and the connectors are eBay specials (18 AWG shielded OFC copper cable, gold-plated brass with gunmetal metal body RCAs). Signal is using the center conductor, and sheild is shield.
Sorry about the poor picture quality, but using my webcam to take pics. Also got a shot of the internals of it. Seems to work fine, so I can't complain thus yet.
