Solid Silver Banana Plugs?

Everyone seems to go with gold as a connection conductor. Would'nt solid silver be kind of soft and then would tarnish/oxidize quickly?

Tarnished silver, or silver oxide poses no conductive risk. Pure silver as well as gold is to soft for use as a jack.

I'd contact Serguei Timachev, Stealth cable designer, and ask him. (Disclosure: I know him. But bias isn't an issue here, is it?) He's at www.interlinkhouse.com, or email at stnemo@starpower.net. He'll give you good information at least, and conceivably even be able to provide what you're asking about. Worth a try.