NOS Matched Quad (4) RCA USA 6F5 Metal rst Vacuum Tubes 100+%

Tube Type / Number: 6F5
Actual Brand*: RCA
Printed Brand: Victor
Quantity of Tubes: Matched Quad (4)
Plate Construction: Metal
Getter Construction: Metal
Country of Manufacture: USA
Visible Date Codes: E & Z3 BR & 3S KN & 309 U4
Lettering Condition: 90 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape:
Smoked Glass? Metal
Engraved Base? No
Boxes Included? Multiple Boxes - SOME Original, Some Generic
Notes: One has Mild Rust

Gm Test Results: 52 & 52 & 52 & 52
Minimum Good Value: 25
NOS Test Value: 42
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.