Athena Audio MC 10

This has RCA input upgrades by Furutech and also spikes included 
The POLYPHASER Magnetic Interface was developed and manufactured by ATHENA Audio, San Francisco California in the early 1980s. This product was designed by Mr. BRUCE BRISSON the founder of MIT cable. Similar to the modules that are hardwired to the Music Interface Technologies (MIT) (and Transparent Audio) ). 

Essentially, the ATHENA Polyphaser is an engineered interface component that is purposefully designed to efficiently transport energy, with a predetermined bandwidth, from one component to another. My personal experience with my own line-level Polyphaser was surprising and my music system is all the better for it. You remove the Polyphaser after living with it for a couple of weeks, and it’s though you changed a major component with the end result not being good. It is a shame that ATHENA line of products did not take off -- they are that good. My guess is that the retail prices were over the top and the advertising did not communicate what these devices were capable of in an effective way.

This has variable cartridge loading from 5k ohm to 100k