(1) Tested RCA 6BK7B Tube with Original Box.
Date Code AS.
This tube tests well above NOS.
The box shows moderate scuffing overall - see photos.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 10,500-10,250 micromhos
Minimum pass/good = 5350-5350
Average NOS rating = 8025-8025
