(1) Tested Ken Rad 6A8GT Tube.
Date Code C5R.
Additionally stamped MR (Maintenance and Repair).
This tube tests above NOS specs.
Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:
Test Result = 1150-550 micromhos
Minimum pass/good = 630-190
NOS Target Value = 945-285
