Date Code MF - the date code and wording on one tube has been completely worn off.
Tubes are closely matched for Gm testing within 5% (see below) and internal structure - they are identical. Attractive glow top filaments with gray ladder plates and side O getters.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 2875-2875 and 3000-2750 micromhos
Minimum pass/good = 1650-1650
Further tested under real operating conditions on a Class A amplifier and exhibiting no microphonics.
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