National Union
NOS NIB National Union NU USA 5Z3 [] Foil Strip Get HANGING FILAMENT Vacuum Tube
- SKU:
- TE3907
- UPC:
- National Union NU 5Z3
- MPN:
- National Union NU 5Z3
- Availability:
- Ships in 1 business day or less.
- Shipping:
- Calculated at Checkout
Description
Tube Type / Number: 5Z3
Actual Brand*: National Union NU
Printed Brand: National Union
Quantity of Tubes: Single
Plate Construction: 2 Black Smooth
Getter Construction: Bottom [] Foil Strip
Country of Manufacture: USA
Visible Date Codes:
Lettering Condition: 100 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape: Circle
Smoked Glass? Clear
Engraved Base? No
Boxes Included? 1 Box - Original
Notes: ST, Hanging Filament
Gm Test Results: 56/54
Minimum Good Value: 40/40
NOS Test Value: 50/50
Life Calculation: 100+% (where 65% = fail)
Tests as NOS?: Yes
True NOS?*: Yes
** 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.