These tubes were tested on a Hickok 600 tube tester.
Recommended result for this tube is 2200/2200 gm
These tubes made by Sylvania with date code 026 AJL tested as follows:
3300/3100 gm, 3200/3200 gm, 3300/3100 gm, 3200/3000 gm, 3200/3400 gm, 3200/3000 gm