Here is a TYPE 56 New-In-Box Old-Stock electron radio vacuum tube from National Union (NU).  This tube is a little dusty from sitting on the shelf, but there is no doubt this tube is new and ready for action!  This was tested on my calibrated TV-7D/U tube tester and passes with flying colors.  For this tube tests NEW at 70, with the minimum of 37.  Pictures show the exact tube that is for sale.  Guaranteed to test new for you or your money back.  FAST shipping in a firm cardboard box from Ohio, USA.

I have been selling on ebay since the 1990s and never received a negative feedback.  If you have an issue after the sale, please let me know so I can fix it.  Thanks for looking and God bless.