NOS NIB Date Matched Quad (4) RCA USA 7A8 Balck Plate O Get Smoked Vacuum Tubes

Tube Type / Number: 7A8
Actual Brand*: RCA
Printed Brand: RCA
Quantity of Tubes: Date Matched Quad (4)
Plate Construction: Balck Ribbed
Getter Construction: Top O
Country of Manufacture: USA
Visible Date Codes: BB
Lettering Condition: 75 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape: Circle
Smoked Glass? Gray Smoked-Full
Engraved Base? No
Boxes Included? Multiple Boxes - ALL Original
Notes:

Gm Test Results: 2400/2200 & 2400/2200 & 2400/2200 & 2400/2200
Minimum Good Value: 650/325
NOS Test Value: 1000/500
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.