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Sylvania

NOS Sylvania USA Type 56 Black Plate D Foil Bottom Get ENGRAVED Vacuum Tube

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SKU:
TB378
UPC:
Sylvania Type 56
MPN:
Sylvania Type 56
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Now: $10.21
Was: $17.01

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Description

Tube Type / Number: Type 56
Actual Brand*: Sylvania
Printed Brand: Sylvania
Quantity of Tubes: Single
Plate Construction: Black Smooth
Getter Construction: D Foil Bottom
Country of Manufacture: USA
Visible Date Codes: 6GR
Lettering Condition: 100 Percent
Year Made:
Mica Spacers: 2
Smoked Glass? No
Engraved Base? Yes
Boxes Included? 1 Box - Not Original
Notes: ST

Gm Test Results: 92

Minimum Good Value: 37
NOS Test Value: 62
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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