SYLVANIA 12AT7 / ECC81 — Vintage Made in USA Pair
Grade: NOS Series
Laboratory Verified
Made in USA
Laboratory Verified
Made in USA
Top Ring Getter
Robust Internal Spacers
Original Box Included
Amplitrex AT1000 Precision Tested
Robust Internal Spacers
Original Box Included
Amplitrex AT1000 Precision Tested
Up for sale is a matched pair of authentic Sylvania 12AT7 / ECC81 vacuum tubes, manufactured in the USA. These tubes feature the classic Top Ring Getter design, renowned for delivering a detailed and dynamic soundstage in high-end audio applications.
Each tube has been individually analyzed using the Amplitrex AT1000 digital tester. This pair exhibits strong emission and transconductance levels, making them an ideal choice for critical listening environments and professional studio equipment.
| Serial No. | Triode Section | Parameter Ip mAdc | Result Ip mAdc | % Ip | Parameter Gm uMhos | Result Gm uMhos | % Gm |
|---|---|---|---|---|---|---|---|
| #2085002 | Section 1 (T1) | 10.0 | 10.0 | 100% | 5500 | 5700 | 103.6% |
| Section 2 (T2) | 10.0 | 11.4 | 114% | 5500 | 5660 | 102.9% | |
| #2085003 | Section 1 (T1) | 10.0 | 9.8 | 98% | 5500 | 5200 | 94.5% |
| Section 2 (T2) | 10.0 | 10.2 | 102% | 5500 | 5470 | 99.4% |
Technical Note: Percentage calculations are based on Amplitrex standard factory parameters for the 12AT7/ECC81 family (Ip = 10.0mA, Gm = 5,500 uMhos).
Email: [email protected]
Precision Verified — NOS Audio Tubes
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