Tests NOS Date Matched Pair Siemens 7308 SILVER SHIELD Gold Pin Vacuum Tubes 90%

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Tube Type / Number: 7308 [Hi-Fi 6922 6DJ8]
Actual Brand*: Siemens
Printed Brand: Siemens
Quantity: 2 Pieces-Matched Pair
Matching Date Codes? Yes
Plate Construction: Gray/Silver Center Shield
Getter Construction: Top Solid Disc
Country of Manufacture: Germany
Visible Date Codes: D71 [2]
Lettering Condition: 90 Percent
Number of Mica Spacers: 2
Mica Shape: Sawblade
Smoked Glass? Clear
Engraved Base? No
Boxes (always included): All WB/Generic
Notes: GOLD PINS [2]
Tested For & Matched By: Gm (General Mutual Transconductance)

Gm Test Results: 65/82 & 77/79

Minimum Good Value: 50/50
NOS Test Value: 82/82
Life Calculation: 83/100% & 94/96% (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.


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.

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