NOS Hytron USA 25Z5 Black Smooth Plate Engraved ST Rattles Vacuum Tube 25Z5G

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Tube Type / Number: 25Z5
Actual Brand*: Hytron
Printed Brand: Hytron
Quantity of Tubes: Single
Plate Construction: Black Smooth
Getter Construction: Bottom D Foil
Country of Manufacture: USA
Visible Date Codes: 96
Lettering Condition: 90 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape: Round
Smoked Glass? Clear
Engraved Base? Yes
Boxes Included? 1 Box - NOT Original
Notes: ST, Tube Rattles

Gm Test Results: 60/60

Minimum Good Value: 40
NOS Test Value: 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.


All of our tubes are 100% guaranteed to arrive as described, test as described and to be void of any sound defects. We offer a 30 day return window from the day you receive the item.

PLEASE NOTE - While we accept returns for basically any fault, we DO NOT accept returns for buyer's remorse which includes buyers who decide they don't like the subjective tonal signature of a tube. We have had people exploit our generous return policy to tube roll on our dime so we have a strict policy against this behavior.

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Additional Information

Item Type:
Vacuum Tubes
Production Era:
Vintage & NOS
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