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One matched pair, circa 1940s, U.S.A. made by ???,
type 6J7G vacuum tubes
as pictured.
Please note: one tube was labeled for Sylvania, the other was branded for Tung-Sol, but both tubes appear to have same internal structure !!!!!!!
Condition:
New Old Stock / New In Boxes
Silk-Screening:
Please refer to photos
Acid Etched Designations:
6J7 / G
6J7 / G
Date/Production Codes:
V4R
???
Tubes feature black metallic plates and bottom-mount dimpled-rectangular-foil getters construction.
Tubes appear identical in construction.
*
Hickok TV-7D/U* tested
@ 51 53
minimum acceptable value for a good tube
31
*Hickok TV-7B/U is a mutual conductance type tube tester. It does check for mutual conductance which is a more accurate measure of tube's age.
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