Description
Tube Type / Number: 6BK7A
Actual Brand*: Barrytron
Printed Brand: Barrytron
Quantity of Tubes: Single
Plate Construction: Black
Getter Construction: Top O
Country of Manufacture: USA
Visible Date Codes: 4-61/AB
Lettering Condition: 100 Percent
Year Made:
Number of Mica Spacers: 2
Mica Shape: Sawblade
Smoked Glass? Clear
Engraved Base? No
Boxes Included? 1 Box - Original
Notes:
Gm Test Results: 77/76
Minimum Good Value: 43/43
NOS Test Value: 71/71
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.