(1) Tested Very Strong RCA Type 42 Tube.
Date Code FGS.
Double bottom square D getters with black oval ribbed plates.
This tube tests well above the average NOS rating.
The tube number is worn off of the glass.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 2450 micromhos
Minimum pass/good = 1260
Average NOS rating = 1920
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