I may have answered my own question. NJ7P has a site with specs for both tubes:
6BK4
http://www.nj7p.org/Tube4.php?tube=6BK4
6BK4C
http://www.nj7p.org/Tube4.php?tube=6BK4C
The "C" seems to be almost identical except for a couple of higher voltage and current specs, probably what I should expect for a newer version of the same number.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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