Tested Very Strong Matched Pair of Sylvania 12AU7A Tubes.
Green Lettering. Date Codes 726.
Tubes are closely matched for mutual conductance (GM). The date codes and internal structures are identical.
Grey plates with copper grid posts and square halo getters.
The wording is partially worn on one tube.
This pair tests above NOS specs.
Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:
Test Result = 2900-2900 and 2900-2700 micromhos
Minimum pass/good = 1400-1400
NOS Target Value = 2100-2100
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