You are bidding on a group of 4 vintage General Electric type JAN 5670W radio/audio tubes made for the US Military.  These are equivalent to Western Electric 396A or 2C51 tubes.  I tested them on my TV-7D/U tester, where the minimum for a good tube is 26 on each plate.  They test at 36 and 38 for one, 34 and 36 for the next, 43 and 39 for the next, and 40 and 44 for the last one.  So, all are good strong tubes.  They are identical with 1972 date codes. They should be great for your project.  Shipping weight is 8 ounces.  Please see my other auctions for more interesting radio and audio items, and tubes.