SYLVANIA JAN 12SN7GT – 4 PCS
GRADE: PLATINUM GRADE MILITARY SPECIFICATION | LABORATORY VERIFIED NOS
Black Base
New in Original GVT Boxes
Made in USA
Amplitrex AT1000 Tested
Offered here is a premium vintage matched quad lot of 4 premium Sylvania JAN 12SN7GT dual-triode audio valves, pristine and clean in their classic original brown government (GVT) vintage boxes. Made in the USA, these highly reliable and rugged military-grade vintage tubes feature high-grade Black Plates and a precision Black Base configuration. These tubes offer an incredible performance upgrade for high-end audio preamplifiers and amplifiers requiring the 12V heater equivalent of the legendary 6SN7 line.
As captured in each individual tube has been rigorously checked and verified on a laboratory-grade Amplitrex AT1000 digital tube analyzer. Following the exact formatting layout verified in the comprehensive data table below provides the full factory parameters alongside the laboratory-measured test results for both triode sections.
| Serial No. | Test Triode | Parameter Ip mAdc | Result Ip mAdc | % Ip | Parameter Gm uMhos | Result Gm uMhos | % Gm |
|---|---|---|---|---|---|---|---|
| 2347001 | T1 | 9.0 | 8.6 | 96% | 2600 | 2500 | 96% |
| T2 | 9.0 | 8.2 | 91% | 2600 | 2600 | 100% | |
| 2347003 | T1 | 9.0 | 7.8 | 87% | 2600 | 2600 | 100% |
| T2 | 9.0 | 8.8 | 98% | 2600 | 2500 | 96% | |
| 2347005 | T1 | 9.0 | 10.0 | 111% | 2600 | 2500 | 96% |
| T2 | 9.0 | 8.8 | 98% | 2600 | 2600 | 100% | |
| 2347034 | T1 | 9.0 | 9.4 | 104% | 2600 | 2600 | 100% |
| T2 | 9.0 | 10.2 | 113% | 2600 | 2500 | 96% |
Note: Custom duties and taxes are the responsibility of the buyer in their country.
Support: [email protected] Precision Verified — NOS Audio Tubes
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