Welcome to Videokarma.
You're not terribly far from me.
Are you aware that the Wisconsin Antique Radio Club is having a swapmeet in Madison this Sunday (next one there after that will probably be in May)?
warci.org
there's a few collectors that bring vintage TVs myself included...
I'm probably going to bring a 1948 Stromberg Carlson and possibly a rough Zenith Flashmatic (first wireless remote TV) to the meet Sunday.
I've got a pretty decent stock of TV signal tubes and could possibly bring some for you (assuming it's something I have and can find in my mess of a collection).