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(1) Tested Very Strong Balanced Tung Sol 12AX7 Tube and Box Gray Plates 620-3

(1) Tested Very Strong Balanced Tung Sol 12AX7 Tube and Box Gray Plates 620-3

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$48.95 USD
$48.95 USD
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(1) Tested Very Strong and Balanced Tung Sol USA 12AX7 Tube with Original Box.
Date Code 620-3 (20th week of 1956).

This tube tests above NOS ratings - see below.

Balanced mutual conductance (Gm) with gray ladder plates and a top bent square getter.
The box has worn edging.
The wording on the tube is partially worn but still legible.

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

Gm Test = 2000-2000 micromhos
Minimum pass/good = 950-950
Average NOS rating = 1425-1425

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