Ken-Rad USA 6D6 3 MICA Smoked Glass ENGRAVED Loose Base Vacuum Tube 91%

Tube Type / Number: 6D6
Actual Brand*: Ken-Rad (Crosley)
Printed Brand: Crosley
Quantity of Tubes: Single
Plate Construction: Silver
Getter Construction: Bottom
Country of Manufacture: USA
Visible Date Codes: GK4
Lettering Condition: 100 Percent
Year Made:
Number of Mica Spacers: 3
Mica Shape: U
Smoked Glass? Black Smoked-Half
Engraved Base? Yes
Boxes Included? 1 Box - NOT Original
Notes: Lose Base

Gm Test Results: 60
Minimum Good Value: 40
NOS Test Value: 66
Life Calculation: 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.