Here is a pair of very strong testing Mullard EL34's. They both test 47 on my Dan Nelson calibrated TV7u, where 30 is minimum good at 70%.Note:  One box in the add says 48 from earlier test, upon retesting it tested a match at 47. Matched date codes of XF2 and B5L2. These have double 0 getters. Most of the printing is gone, but you don't listen to the labels!