Up for sale here is this rare vintage Sylvania set of 5 engineering sample tubes. Four are 6U8 tubes and one is a 6AU8 tube. There is some writing on one side, and the box corners are coming apart. It looks great as a display item. This is untested and is sold for display, not for use. Please see my pictures for details.

US shipping and handling is $5, and international is $28. If you have any questions, please ask.

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