NIB Sylvania USA 1A1 Plate Get Engraved Base Vacuum Tube

Tube Type / Number: 1A1
Actual Brand*: Sylvania
Printed Brand: Philco
Quantity of Tubes: Single
Plate Construction:
Getter Construction:
Country of Manufacture: USA
Visible Date Codes: 5MR 06
Lettering Condition: 100 Percent
Year Made:
Mica Spacers: 2
Smoked Glass? No
Engraved Base? Yes
Boxes Included? 1 Box - Original
Notes:

Gm Test Results: Untested NOS NIB - Appears to be NOS based on getter flashing and lettering condition. Returns will be accepted for DOA untested tubes.
Minimum Good Value: N/A
NOS Test Value: N/A
Life Calculation: % (where 65% = fail)

Tests as NOS?:
True NOS?*:

** 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.