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  • 1957 Sylvania USA 6SN7GTB Black T Angled Chrome Dome Vacuum Tube 112/90%

1957 Sylvania USA 6SN7GTB Black T Angled Chrome Dome Vacuum Tube 112/90%

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Product Description

Tube Type / Number: 6SN7GTB
Actual Brand*: Sylvania
Printed Brand: Reliable
Quantity of Tubes: Single
Plate Construction: Black T Angled 5 Rivet Holes
Getter Construction: Top
Country of Manufacture: USA
Visible Date Codes: H7B 57-48
Lettering Condition: 75 Percent
Year Made: 1957
Mica Spacers: 2
Smoked Glass? No
Engraved Base? No
Boxes Included? 1 Box - Not Original
Notes: Chrome Dome, Short Base

Gm Test Results: 92/74

Minimum Good Value: 50/50
NOS Test Value: 82/82
Life Calculation: 112/90% (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.

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