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  • NOS Croydon USA 25Z5 Black Plate D Foil Get Engraved Base ST rtl Vacuum Tube

NOS Croydon USA 25Z5 Black Plate D Foil Get Engraved Base ST rtl Vacuum Tube

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Product Description

Tube Type / Number: 25Z5
Actual Brand*: Croydon
Printed Brand: Croydon
Quantity of Tubes: Single
Plate Construction: Black Smooth
Getter Construction: D Foil
Country of Manufacture: USA
Visible Date Codes: T26
Lettering Condition: 50 Percent
Year Made:
Number of Mica Spacers: 2Oval Wing
Glass Coating: Clear
Engraved Base? Yes
Boxes Included? 1 Box - NOT Original
Notes: ST, Rattles

Gm Test Results: 54/51

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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