Tested Matched Pair of National Union 6N7GT/G Tubes with Original Boxes.
Date Codes JR.
The codes on the front tabs of the boxes (JR) are the same as the codes on the tubes, so you know that these are the same boxes they left the factory with.
Tubes are closely matched for mutual conductance (GM), date codes and internal structure - of which they are identical.
Gray smoked glass envelopes with black rounded plates and bottom square D getters.
These tubes test as NOS.
Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:
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