ETI Research FR-TC07 RCA chassis female - Tellurium Copper Connector (par)RCA FR TC07 terminals offer increased conductivity but also integrate new additions. Competitors mostly use bases made of nickel, gilded brass or bronze phosphorus alloys, with a limited conductivity often below 28% International Annealed Copper Standard (IACS), and thus diminishing the performance of the components to which they connect. On the contrary, ETI takes a different approach, promoting the use of high purity Tellurium copper (more than 95 %