Up for sale here is this NOS NIB Ken-Rad 6N7 vacuum tube, circa 1948.  It is untested but guaranteed to work great for you.  It looks like a previous owner tested it.  This had some green corrosion on the pins, which I wire-brushed off, but they were brownish underneath.  This is still guaranteed to work, but I wanted to be clear that the pins are somewhat discolored.  Please see my pictures for details.

US shipping and handling is $4, and international is $14.  I accept Paypal.  If you have any questions, please ask.

I have a number of other tubes & sockets, collectibles, Magic cards, and vintage electronics listed--feel free to take a look!