(1) Tested Strong Sylvania 25AV5GT Tube.
Gray plates with a square D halo getter.
The wording on the base is slightly faded but still very legible.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 4850 micromhos
Minimum pass/good = 2450
~ Please view all 4 photos ~
