Tested Matched Pair of RCA 6SN7GT Tubes.
Date Codes LI and LQ.
Reinforced support rods with black ladder plates (not offset) and bottom square D getters.
The tube numbers are worn off of the glass.
Tubes are closely matched for mutual conductance (Gm) and internal structures which are identical.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 2500-2650 and 2450-2750 micromhos
Minimum pass/good = 1650-1650
Also performance tested in-circuit through a Class A amplifier with no microphonics detected.
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