I was wondering about this a few weeks ago. I think that Nordost's banana plugs are either plated with, or solid silver, but I'm not sure. They never answered my inquiries.
Why doesn't Stage 3 Concepts have a website? I ordered literature from them about 2 years ago, but never have spoken with anyone in person (they don't answer their phone, it's voice mail). Jim, the next time you speak with them, tell them they need a website.
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