Brimar CV4003 / 12AU7
MILITARY SPEC | BIG RING GETTER | MADE IN ENGLAND | MATCHED QUAD
England
Big Ring Getter
Matched Quad (4)
Up for sale is a rare, laboratory-matched quad (4 pieces) of Brimar CV4003 vacuum tubes. These are the ruggedized military-specification equivalents to the 12AU7/ECC82, featuring Big Ring Getters and high-quality British manufacturing. Brimar CV4003s are world-renowned for their ultra-low microphonics and superior sonic performance.
Precision tested on our Amplitrex AT1000 digital laboratory system, the results below utilize the Percentage Method against original factory design-center specifications (Ip = 10.5 mA / Gm = 2200 µMhos). This quad has been meticulously selected for balance and high emission levels, ensuring a perfect match for high-end audio gear.
| Serial No. | Test Triode – T1/T2 | Parameter ip mAdc | Result ip mAdc | % Ip (Emission) | Parameter Gm uMhos | Result Gm uMhos | % Gm (Transc.) |
|---|---|---|---|---|---|---|---|
| #802069 | Triode 1 | 10.5 | 10.8 | 102.8% | 2200 | 2120 | 96.3% |
| Triode 2 | 10.5 | 11.4 | 108.5% | 2200 | 2200 | 100.0% | |
| #802146 | Triode 1 | 10.5 | 10.4 | 99.0% | 2200 | 2110 | 95.9% |
| Triode 2 | 10.5 | 11.4 | 108.5% | 2200 | 2200 | 100.0% | |
| #802061 | Triode 1 | 10.5 | 10.2 | 97.1% | 2200 | 2150 | 97.7% |
| Triode 2 | 10.5 | 11.6 | 110.4% | 2200 | 2200 | 100.0% | |
| #802216 | Triode 1 | 10.5 | 10.6 | 100.9% | 2200 | 2100 | 95.4% |
| Triode 2 | 10.5 | 11.2 | 106.6% | 2200 | 2200 | 100.0% |
⚠️ International Buyers: Custom duties and taxes are the responsibility of the buyer in their country.
Note: Extended area surcharges may apply for remote addresses; please confirm before checkout.
Quality Verified Since 1970
Specializing in thoroughly screened vacuum tubes with an inventory of approx. 300,000 units.
Testing equipment includes Amplitrex AT1000, Hickok 752a, and AVO Type 160.
Custom duties and taxes are the responsibility of the buyer in their country.
Support: [email protected] Precision Verified — NOS Audio Tubes
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