MULLARD M8136 / CV4003 – MATCHED PAIR (2 PCS)
Grey Plate
Ring Getter
Made in Great Britain
Military Spec M8136 / 12AU7 / CV4003
New in White Box
Amplitrex AT1000 Tested
Up for sale is a matched pair (2 pcs) of genuine vintage NOS Mullard M8136 (premium military equivalent to 12AU7 / ECC82 / CV4003) dual triode vacuum tubes, manufactured in Great Britain and supplied in white boxes. World-renowned for their signature British sound—delivering smooth, lush mids, exceptional detail, and outstanding dynamic range—these tubes feature sturdy grey plates and ring getters. An unbeatable choice for audiophile preamps, DAC line stages, and hi-fi amplifiers taking 12AU7 / ECC82 / CV4003 series tubes.
Both tubes have been fully tested on a precision Amplitrex AT1000 tube tester. Measured Plate Current (Ip in mA) and Mutual Conductance (uMhos) alongside percentage performance ratings relative to nominal factory reference specs (Reference: 10.5 mA / 2,200 uMhos) 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.1297308 | Triode 1 | 10.5 mA | 10.2 mA | 97% | 2200 | 2350 | 107% |
| Triode 2 | 10.5 mA | 10.6 mA | 101% | 2200 | 2400 | 109% | |
| SR.NO.3439020 | Triode 1 | 10.5 mA | 9.8 mA | 93% | 2200 | 2320 | 105% |
| Triode 2 | 10.5 mA | 10.6 mA | 101% | 2200 | 2400 | 109% | |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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