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(1) Tested Balanced RCA 12SL7GT Tube Black Plates DD Cleaver Brooks 12SL7 GT (b)

(1) Tested Balanced RCA 12SL7GT Tube Black Plates DD Cleaver Brooks 12SL7 GT (b)

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(1) Tested Balanced RCA 12SL7GT Tube with Cleaver Brooks Box.
Date Code DD. Cleaver Brooks part No. 832 165

Balanced mutual conductance (Gm) with a bottom square getter and black 4 hole rounded plates.

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

Gm Test = 1500-1500 micromhos
Minimum pass/good = 1000-1000

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