Tested at 53/53 & 53/54
on a calibrated TV-7D/U tube tester on which 40/40 is the minimum
***On some tubes the minimum being 65% of the typical new score is not a workable formula on the TV7-D/U. So a % score is not meaningful and only an actual meter reading is given. These are
5AU4 - 5V3 - 5Y3GT - 6BL8 - 6BM8 - 6GM8 - 6X4 - 6X5GT - 12BH7 - 22KV6 - 76 - 5842
Test results may differ between various testers for many reasons such as technical design, aging components, etc. So while test results are a good indication of quality there can be some difference between the many differently designed & maintained testers.