Classic Currents
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Tested matched pair of RCA 6SN7GTB Tubes.
Matching date codes of KQ, placing their production to November of 1957.
Tubes are closely matched for mutual conductance (GM). The date codes and internal structures are identical.
Black offset plates with bottom square D getters.
The tube numbers are worn and faded from the glass.
These tubes test 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 = 2750-2625 and 2625-2550 micromhos
Minimum pass/good = 1650-1650
NOS Target Value = 2475-2475
Also performance tested in-circuit through a Class A amplifier with no microphonics detected.
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