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National Union

National Union NU USA 6A4 Silver Plate BTM Thimble Get Engraved Base Vacuum Tube

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SKU:
TE2399
UPC:
National Union NU 6A4
MPN:
National Union NU 6A4
Availability:
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Was: $9.75

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Description

Tube Type / Number: 6A4
Actual Brand*: National Union NU
Printed Brand: National Union
Quantity of Tubes: Single
Plate Construction: Silver Ribbed
Getter Construction: Bottom Thimble
Country of Manufacture: USA
Visible Date Codes:
Lettering Condition: 100 Percent
Year Made:
Number of Mica Spacers: 2Circle
Glass Coating: Clear
Engraved Base? Yes
Boxes Included? 1 Box - NOT Original
Notes:

Gm Test Results: 76

Minimum Good Value: 50
NOS Test Value: 82
Life Calculation: 100+% (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.

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Additional Information

Item Type:
Vacuum Tubes
Production Era:
Vintage & NOS
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