Matched Trio (3) National Union NU USA Type 24A Solid Plate Vacuum Tubes 90%

Tube Type / Number: Type 24A
Actual Brand*: National Union NU
Printed Brand: National Union
Quantity of Tubes: Matched Trio (3)
Plate Construction: Solid Silver
Getter Construction: D Foil
Country of Manufacture: USA
Visible Date Codes: CR & 1C & LC/NV
Lettering Condition: 100 Percent
Year Made:
Mica Spacers: 2
Smoked Glass? No
Engraved Base? No
Boxes Included? 3 Boxes - All NOT Original
Notes: ST

Gm Test Results: 34 & 38 & 38
Minimum Good Value: 25
NOS Test Value: 41
Life Calculation: 83% & 93% & 93% (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.