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  • NOS Matched Pair National Union NU 5Z3 Foil Strip HANGING FILAMENT Vacuum Tubes

NOS Matched Pair National Union NU 5Z3 Foil Strip HANGING FILAMENT Vacuum Tubes

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Product Description

Tube Type / Number: 5Z3
Actual Brand*: National Union NU
Printed Brand: National Union
Quantity of Tubes: Matched Pair
Plate Construction: 2 Black Ribbed
Getter Construction: Bottom [] Foil Strip
Country of Manufacture: USA
Visible Date Codes: MR & MR HN
Lettering Condition: 100 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape: Circle
Smoked Glass? Clear
Engraved Base? No
Boxes Included? Multiple Boxes - NONE Original
Notes: ST, Hanging Filament

Gm Test Results: 52/54 & 58/58

Minimum Good Value: 40/40
NOS Test Value: 50/50
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.

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