GENERAL ELECTRIC GE JAN-12AT7WA — Matched Quad 4 Pcs
Made in USA
Top Ring Getter
Grey Plates
1979 Vintage (Date Code: 79-42)
Amplitrex AT1000 Tested
Up for sale is a beautiful, precision-analyzed matched quad set of four pieces (4 Pcs) of vintage General Electric JAN-12AT7WA high-vacuum twin triode tubes. The JAN-12AT7WA / ECC81 designation denotes a highly ruggedized military specification, manufactured with extra structural support to ensure extremely low microphonics, rigorous electrical stability, and a vastly prolonged service lifespan compared to standard consumer glass.
All four tubes are in immaculate condition, presenting pristine, sharp signature Green Print factory stamps reading “JAN 12AT7WA / MADE IN U.S.A.”. This premium batch features highly stable Grey Plates and a clear Top Ring Getter configuration. They were produced concurrently in the United States in late 1979, sharing the identical vintage matching production date code 79-42.
Testing & Verification: Every single section of these dual-triodes has been thoroughly pre-heated and evaluated under full target operating conditions on our reference Amplitrex AT1000 tester. They exhibit outstanding emission values, making them perfectly matched pairs for high-fidelity audio preamplifiers, line stages, and high-end stereo gear.
| Tube Serial No. | Parameter Ip mAdc | Result Ip mAdc | % Ip | Parameter Gm uMhos | Result Gm uMhos | % Gm |
|---|---|---|---|---|---|---|
| SR. NO. 2390385 -T1 | 10.0 | 10.2 | 102% | 5500 | 5670 | 103.09% |
| -T2 | 10.0 | 11.0 | 110% | 5500 | 5900 | 107.27% |
| SR. NO. 2390412 -T1 | 10.0 | 12.6 | 126% | 5500 | 6190 | 112.54% |
| -T2 | 10.0 | 12.0 | 120% | 5500 | 6070 | 110.36% |
| SR. NO. 2390030 -T1 | 10.0 | 10.4 | 104% | 5500 | 6020 | 109.45% |
| -T2 | 10.0 | 10.8 | 108% | 5500 | 6090 | 110.72% |
| SR. NO. 2390260 -T1 | 10.0 | 11.4 | 114% | 5500 | 6040 | 109.81% |
| -T2 | 10.0 | 10.8 | 108% | 5500 | 6030 | 109.63% |
About NOS Audio Tubes
We are professional suppliers of high-quality vacuum tubes with a specialized industry lineage dating back to the 1970s. Maintaining a vast global reserve of nearly 300,000 pristine valves, we focus on high-fidelity audio equipment and vintage electronics. Every tube is verified utilizing premium testing gear like the Amplitrex AT1000 to offer our global community reliable, transparent grading.
Note: Custom duties and Taxes are the Responsibility of the Buyer in their Country.
Note: We Have More Than 400 Pcs
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