NOS NIB NU National Union USA 117L7GT = 117M7GT Smoked Brown Base Vacuum Tube
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- Calculated at Checkout
Tube Type / Number: 117L7GT = 117M7GT
Actual Brand*: NU National Union
Printed Brand: NU
Quantity: 1 Piece-Single
Matching Date Codes?
Plate Construction: Gray
Getter Construction: Bottom D Dimple Foil
Country of Manufacture: USA
Visible Date Codes: JU
Lettering Condition: 75 Percent
Number of Mica Spacers: 2
Mica Shape: Hexagon
Smoked Glass? Black Smoked-Half
Engraved Base? No
Boxes (always included): All Original
Notes: BROWN BASE
Tested For & Matched By: Gm (General Mutual Transconductance)
Gm Test Results: 83/57
Minimum Good Value: 50/40
NOS Test Value: 82/50
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.
All of our tubes are 100% guaranteed to arrive as described, test as described and to be void of any sound defects. We offer a 30 day return window from the day you receive the item.
PLEASE NOTE - While we accept returns for basically any fault, we DO NOT accept returns for buyer's remorse which includes buyers who decide they don't like the subjective tonal signature of a tube. We have had people exploit our generous return policy to tube roll on our dime so we have a strict policy against this behavior.
Vintage & NOS