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(1) Tested Strong 1957 Tung Sol JTL 5687 Tube Black Plates Copper Rods Code 748

(1) Tested Strong 1957 Tung Sol JTL 5687 Tube Black Plates Copper Rods Code 748

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(1) Tested Very Strong Tung-Sol JTL-5687 Tube.
Date Code 748 (48th week of 1957).

Black plates with copper rods and a horseshoe halo getter.

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

Gm Test = 9875-10,000 micromhos
Minimum pass/good = 4800-4800

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