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(1) Tested 1970 Sylvania 6BZ6 Tube Red Letters with Box Code ec ABZ Pentode

(1) Tested 1970 Sylvania 6BZ6 Tube Red Letters with Box Code ec ABZ Pentode

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(1) Tested Strong Sylvania 6BZ6 Tube with Original Box.
Date Code ec ABZ (March of 1970).

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:

Gm Test = 3300 micromhos
Minimum pass/good = 1575
NOS rating = 2365

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