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Tube Type / Number: 12AT6 [HBC90]
Actual Brand*: RCA
Printed Brand: RCA
Quantity of Tubes: Matched Pair
Plate Construction: Silver/Black Smooth
Getter Construction: Top 
Country of Manufacture: USA
Visible Date Codes: 6-52 & 7-52
Lettering Condition: 75 Percent
Mica Spacers: 2
Smoked Glass? No
Engraved Base? No
Boxes Included? 2 Boxes - ONE Original, ONE NOT Original
Gm Test Results: 40/45/54 & 45/66/52
Minimum Good Value: 30/40/40
NOS Test Value: 49/45/45
Life Calculation: 82% & 92% (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.