Westinghouse USA 6SN7GTB Black Flat-Offset Plate Side [] Get Vacuum Tube 87/99%

Tube Type / Number: 6SN7GTB
Actual Brand*: Westinghouse
Printed Brand: Zenith
Quantity of Tubes: Single
Plate Construction: Black Flat-Off-Set
Getter Construction: Side []
Country of Manufacture: USA
Visible Date Codes: 337/535/DJ
Lettering Condition: 90 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape: Saw Razor
Smoked Glass? Clear
Engraved Base? No
Boxes Included? 1 Box - NOT Original
Notes:

Gm Test Results: 2190/2390
Minimum Good Value: 1560/1560
NOS Test Value: 2400/2400
Life Calculation: 87/99% (where 65% = fail)

Tests as NOS?: No
True NOS?*: No

** Please note, many tubes will test NOS but will actually have a few hours of use on them. A truly NOS tube will have excellent getter flashing condition, no dirt/grime, usually in the original box, and no filament deposits. If a tube is listed  as "tests NOS" but is listed as "not True NOS" please expect the tube to have a small amount of use *

All tubes have been tested using only the best tube testers. We have a large fleet of tube testers, and every single one of them has been calibrated within the last year by industry experts. We mainly use the Hickok TV-7D/U, but occasionally we may use a Hickok 539, 533A, or 600A.