Tested Matched Pair of GE 6SN7GTB Tubes.
Date Codes 62-26 and 61-09.
Tubes are closely matched for mutual conductance (Gm) and internal structure - they are identical.
Gray plates with copper grid posts, side horseshoe getters and top sawtooth mica spacers.
Tested on a calibrated Hickok TV-10 military tube tester with no shorts and no leaks with the following results:
Gm Test = 2875-2925 and 2925-2875 micromhos
Minimum pass/good = 1650-1650
Also performance tested in-circuit through a Class A amplifier with no microphonics detected.
~ Please view all 5 photos ~
