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Classic Currents

(1) Tested GE 12SN7GTA Tube with Box Gray Plates Date Code 60-48 12SN7 GTA

(1) Tested GE 12SN7GTA Tube with Box Gray Plates Date Code 60-48 12SN7 GTA

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(1) Tested GE 12SN7GTA Tube with Original Box.
Date Code 60-48.

The box has scuffing and wear overall with some fading and light writing on the front tab - see photos.

Gray 4 hole plates with a side horseshoe getter. 

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

Gm Test = 2875-2750 micromhos
Minimum pass/good = 1650-1650

Further tested under real operating conditions on an amplifier and presenting no microphonics.

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