SYLVANIA JAN-12SN7GT – MATCHED PAIR (2 PCS)
GRADE: GOLD SERIES | VINTAGE US MILITARY SPECIFICATION
Sylvania JAN-12SN7GT Joint Army-Navy
Military Grade Specification
Black Plate Black Base
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 Pcs) of vintage NOS military-grade Sylvania JAN-12SN7GT dual triode vacuum tubes, packed in white boxes. Manufactured in the USA to joint army-navy military specifications, these classic octal tubes are the 12.6V heater equivalent of the famed 6SN7GT. Featuring iconic black plates, a solid black base, and ruggedized internal construction, these Sylvania valves are celebrated for their superb dynamic authority, warm midrange, and outstanding detail retrieval in audio preamplifiers and driver stages.
Both tubes have been thoroughly tested on an Amplitrex AT1000 automated valve tester at nominal factory specs. Anode current (Ip) and Mutual Conductance (uMhos) measurements alongside percentage performance ratings relative to standard specs are detailed in the table below.
| Serial No. | Triode Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO. 2347009 | Triode 1 (T1) | 9.0 mA | 9.8 mA | 109% | 2600 uMhos | 2700 uMhos | 104% |
| Triode 2 (T2) | 9.0 mA | 7.6 mA | 84% | 2600 uMhos | 2400 uMhos | 92% | |
| SR.NO. 2347013 | Triode 1 (T1) | 9.0 mA | 8.5 mA | 94% | 2600 uMhos | 2600 uMhos | 100% |
| Triode 2 (T2) | 9.0 mA | 8.4 mA | 93% | 2600 uMhos | 2600 uMhos | 100% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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