Matched Pair Ken-Rad USA JAN-CKR-6J7/VT-91 Metal Vacuum Tubes 75% & 88%

Tube Type / Number: JAN-CKR-6J7/VT-91
Actual Brand*: Ken-Rad
Printed Brand: Ken-Rad
Quantity of Tubes: Matched Pair
Plate Construction:
Getter Construction:
Country of Manufacture: USA
Visible Date Codes: S4 & T4
Lettering Condition: 90 Percent
Year Made:
Number of Mica Spacers:
Mica Shape:
Smoked Glass? Metal
Engraved Base? No
Boxes Included? Multiple Boxes - ALL Original
Notes:

Gm Test Results: 38 & 45
Minimum Good Value: 31
NOS Test Value: 51
Life Calculation: 75% & 88% (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.