Matched Pair CBS-Hytron USA 6SN7GTB Black T-Offset Plate Vacuum Tubes 90%

Tube Type / Number: 6SN7GTB
Actual Brand*: CBS-Hytron
Printed Brand: CBS
Quantity of Tubes: Matched Pair
Plate Construction: Black T-Off-Set
Getter Construction: Side Fat D
Country of Manufacture: USA
Visible Date Codes: 58-48 & TG
Lettering Condition: 90 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape: Oval Saw
Smoked Glass? Clear
Engraved Base? No
Boxes Included? Multiple Boxes - NONE Original
Notes:

Gm Test Results: 2320/2190 & 2120/2050
Minimum Good Value: 1560/1560
NOS Test Value: 2400/2400
Life Calculation: 97/91% & 88/85% (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.