In Box CBS-Hytron USA 7AU7 Black Wrinkled Plate Top O Get Vacuum Tube 117/91%

Tube Type / Number: 7AU7
Actual Brand*: CBS-Hytron
Printed Brand: CBS
Quantity of Tubes: Single
Plate Construction: Black Wrinkled
Getter Construction: Top O
Country of Manufacture: USA
Visible Date Codes: 60-36
Lettering Condition: 90 Percent
Year Made:
Mica Spacers: 2
Smoked Glass? No
Engraved Base? No
Boxes Included? 1 Box - Original
Notes: Copper Grids

Gm Test Results: 108/84
Minimum Good Value: 56/56
NOS Test Value: 92/92
Life Calculation: 117/91% (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.