NOS RCA USA 6BK4C/6EL4A Grey Round Plate 2 Bottom O Get Vacuum Tube 100%

Tube Type / Number: 6BK4C/6EL4A
Actual Brand*: RCA
Printed Brand: Sears
Quantity of Tubes: Single
Plate Construction: Grey Round
Getter Construction: 2 Bottom O
Country of Manufacture: USA
Visible Date Codes: 274 EL D38K
Lettering Condition: 100 Percent
Year Made:
Number of Mica Spacers:
Mica Shape:
Smoked Glass? Clear
Engraved Base? No
Boxes Included? 1 Box - NOT Original
Notes:

Gm Test Results: 30
Minimum Good Value: 17
NOS Test Value: 28
Life Calculation: 100+% (where 65% = fail)

Tests as NOS?: Yes
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.