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Classic Currents

(1) Tested Balanced National 6SN7GTB Tube Black Plates Code 5-39 RCA 6SN7 GT

(1) Tested Balanced National 6SN7GTB Tube Black Plates Code 5-39 RCA 6SN7 GT

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(1) Tested Balanced National 6SN7GTB Tube.
Date Code 5-39.
The 274 EIA code indicates that this tube was made by RCA for National.

Balanced mutual conductance (Gm), with black offset plates and a side square getter.
The tube number is worn off of the glass.

This tube tests as NOS.

Tested on a calibrated Hickok TV-10 military tube tester and exhibiting no shorts or leaks with the following results:

Test Result = 2500-2500 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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