MAZDA ECC81/12AT7 – MATCHED PAIR (2 PCS)
GRADE: GOLD SERIES | VINTAGE ENGLAND MANUFACTURE
Mazda Brand Label
ECC81 / 12AT7 Specification
Grey Plate
Top Big Ring Getter
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 Pcs) of vintage NOS Mazda ECC81 / 12AT7 dual triode audio tubes, packed in clean white boxes. Made in England, these desirable vintage valves feature classic grey plate construction and a prominent top big ring getter design. Revered by audio enthusiasts for their smooth midrange presentation, excellent detail retrieval, and quiet noise performance in high-end audio preamplifiers, phase inverters, and driver circuits.
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. 5396001 | Triode 1 | 10.0 mA | 8.6 mA | 86% | 5500 uMhos | 4840 uMhos | 88% |
| Triode 2 | 10.0 mA | 9.4 mA | 94% | 5500 uMhos | 5700 uMhos | 104% | |
| SR.NO. 5396002 | Triode 1 | 10.0 mA | 8.8 mA | 88% | 5500 uMhos | 4900 uMhos | 89% |
| Triode 2 | 10.0 mA | 10.2 mA | 102% | 5500 uMhos | 5400 uMhos | 98% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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