SYLVANIA 12AT7WA / ECC81 – MATCHED PAIR (2 PCS)
GRADE: PLATINUM SERIES | VINTAGE USA MANUFACTURE
Sylvania Vintage Dual Triode
12AT7WA / ECC81 Specification
Gray Plate Construction
Top Ring Getter
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 Pcs) of prime vintage NOS Sylvania 12AT7WA / ECC81 military-grade dual triode tubes, packed in white boxes. Manufactured in the USA, these sought-after valves feature robust gray plates, a classic top ring getter, and heavy-duty military-spec construction. Renowned by audiophiles and guitar amplifier enthusiasts for superior low-noise performance, high detail, balanced tonal clarity, and long operational life in preamp and phase inverter stages.
Both tubes have been thoroughly tested on an Amplitrex AT1000 automated valve tester. Plate Current (Ip) and Transconductance (uMhos) measurements for both Triode 1 (T1) and Triode 2 (T2) alongside percentage performance ratings relative to standard factory specs (10.5mA 2200uMhos) are detailed in the table below.
| Serial No. | Tube Section | Plate Current (Ip) | Transconductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % Gm | ||
| SR.NO. 2340002 | Triode 1 (T1) | 10.5 mA | 10.6 mA | 101% | 2200 uMhos | 5800 uMhos | 264% |
| Triode 2 (T2) | 10.5 mA | 10.0 mA | 95% | 2200 uMhos | 5800 uMhos | 264% | |
| SR.NO. 2340042 | Triode 1 (T1) | 10.5 mA | 11.6 mA | 110% | 2200 uMhos | 5880 uMhos | 267% |
| Triode 2 (T2) | 10.5 mA | 10.0 mA | 95% | 2200 uMhos | 5690 uMhos | 259% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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