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  • NOS NIB Matched Quad (4) RCA USA 12SK7 Metal Vacuum Tubes 100+%

NOS NIB Matched Quad (4) RCA USA 12SK7 Metal Vacuum Tubes 100+%

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Product Description

Tube Type / Number: 12SK7
Actual Brand*: RCA
Printed Brand: RCA
Quantity of Tubes: Matched Quad (4)
Plate Construction: Metal
Getter Construction: Metal
Country of Manufacture: USA
Visible Date Codes: BK & ML & M-R V3 & 243
Lettering Condition: 100 Percent
Year Made:
Mica Spacers: 2
Smoked Glass? No
Engraved Base? No
Boxes Included? 4 Boxes - ALL Original
Notes: All American 5

Gm Test Results: 88 & 88 & 88 & 98

Minimum Good Value: 48
NOS Test Value: 79
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.

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