Graham SW-1 vs SW-3 Anyone compared them?


Has anyone listened to both the SW-1 and SW-3 armwands and compared them? Any/What differences?
I am currently using a SW-3 and a copper wired phono cable and wonder if the differences between the wire are causing a problem I am having. I had heard not to mix wire types so I am wondering if this is a problem.
Thanks
gerardff