Tested Matched Pair of 1969 Sylvania 6BQ7A 6BZ7 Tubes with Original Boxes.
Red Letters. Date Codes db ADT (February, 1969).
Tubes are matched for Gm testing, internal structure and production date codes.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 7250-7500 and 7250-7500 micromhos
Minimum pass/good = 4000-4000
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