MULLARD ECC81/12AT7 – MATCHED PAIR (2 PCS)
GRADE: GOLD SERIES | VINTAGE BRITISH MANUFACTURE
Mullard ECC81 / 12AT7
Rare Square Getter
Grey Plate
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 Pcs) of highly collectible vintage NOS Mullard ECC81 / 12AT7 dual triode vacuum tubes, packed in white boxes. Manufactured in Great Britain, these early production tubes feature the highly sought-after square getter and classic grey plates. Renowned in high-end audio preamps, driver stages, and classic equipment, early British Mullard ECC81s are celebrated for their warm tonal character, smooth mid-range body, and exceptional musical detail.
Both tubes have been thoroughly tested on an Amplitrex AT1000 automated valve tester at nominal factory specs. Anode current (Ip) and Mutual Conductance (uMhos) measurements alongside percentage performance ratings relative to standard specs are detailed in the table below.
| Serial No. | Triode Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO. 2786013 | T1 | 10.0 mA | 7.4 mA | 74% | 5500 uMhos | 4500 uMhos | 82% |
| T2 | 10.0 mA | 8.2 mA | 82% | 5500 uMhos | 4800 uMhos | 87% | |
| SR.NO. 2786023 | T1 | 10.0 mA | 10.0 mA | 100% | 5500 uMhos | 4600 uMhos | 84% |
| T2 | 10.0 mA | 10.6 mA | 106% | 5500 uMhos | 4770 uMhos | 87% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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