MULLARD ECC81 / 12AT7 – Matched PAIR (2 PCS)
GRADE: GOLD SERIES | VINTAGE GREAT BRITAIN MANUFACTURE
Mullard Vintage Dual Triode
ECC81 / 12AT7 Specification
3-Hole Plate Construction
Top Ring Getter
New in White Box
Amplitrex AT1000 Tested
Up for sale is a pair (2 Pcs) of prime vintage NOS Mullard ECC81 / 12AT7 dual triode audio tubes, packed in white boxes. Manufactured in Great Britain, these highly regarded tubes feature classic 3-hole plate construction, a top ring getter, and crisp original glass markings. Famous among audiophiles and vintage audio enthusiasts for providing lush mid-range warmth, excellent resolution, and dynamic response in preamplifiers, phase inverters, and driver stages.
Both tubes have been tested on an Amplitrex AT1000 automated valve tester at nominal reference settings. Plate Current (Ip) and Transconductance (uMhos) measurements alongside percentage performance ratings relative to standard factory specs 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. 1461030 | T1 | 10.0 mA | 10.6 mA | 106% | 5500 uMhos | 5110 uMhos | 93% |
| T2 | 10.0 mA | 9.2 mA | 92% | 5500 uMhos | 4800 uMhos | 87% | |
| SR.NO. 1461085 | T1 | 10.0 mA | 9.6 mA | 96% | 5500 uMhos | 4900 uMhos | 89% |
| T2 | 10.0 mA | 10.0 mA | 100% | 5500 uMhos | 5000 uMhos | 91% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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