NOS Matched Trio (3) Sylvania USA 50C5 [HL92] Black Plate [] Get Vacuum Tubes

Tube Type / Number: 50C5 [HL92]
Actual Brand*: Sylvania
Printed Brand: Sylvania
Quantity of Tubes: Matched Trio (3)
Plate Construction: Black Ribbed
Getter Construction: Top []
Country of Manufacture: USA
Visible Date Codes: 341 H3E & 239 B2E & AF L3F
Lettering Condition: 100 Percent
Year Made:
Number of Mica Spacers: 2Saw
Glass Coating: Clear
Engraved Base? No
Boxes Included? Multiple Boxes - NONE Original
Notes: All American 5

Gm Test Results: 76 & 80 & 80
Minimum Good Value: 45
NOS Test Value: 70
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.