12AU7 BRIMAR Square Getter Made in England Apmlitrex Tested Tube Qty 2 Pcs

BRIMAR 12AU7 — Matched Pair (2 Pcs)

Up for sale is an incredibly rare, highly sought-after matched pair of two pieces (2 Pcs) of vintage original Brimar 12AU7 twin triode vacuum tubes. Universally acclaimed by high-end audiophiles for their expansive soundstage, highly detailed textures, and dead-silent low-noise operation, these classic British-engineered triodes are a superb upgrade for premium preamplifiers, phono stages, line drivers, and high-fidelity tube gear.

As shown in our reference verification and the detailed structural close-up this pair represents the absolute pinnacle of early Brimar craftsmanship. Structurally, they feature the coveted Long Black Plate construction paired with the highly desirable vintage Square Getter configuration, giving them a distinctively warm, liquid, yet deeply resolving sonic presentation. Both valves are pristine, unused, and clearly stamped near the base seals with their original production codes—4L5 / 571 on the left tube Serial 2021019 and 3K5 / 571 on the right tube Serial 2021016—and come safely housed in fresh protective white collector boxes.

Testing & Verification: This dual-triode pair has been rigorously screened and balanced on our laboratory-calibrated Amplitrex AT1000 tester. Measured under full operational factory voltages against the standard 12AU7 factory datasheet parameters of Ip = 10.5 mA and Gm = 2,200 uMhos, both sections across both tubes show excellent electrical health, robust emissions, and tightly balanced mutual characteristics perfect for premium stereo configurations.

About NOS Audio Tubes

We are specialized suppliers of high-grade vintage vacuum tubes and valves, maintaining an industry lineage established back in the 1970s. With an extensive inventory of nearly 300,000 components, we serve high-end audiophiles and vintage equipment restoration collectors worldwide. Every tube is strictly evaluated using calibrated industrial testing instruments such as the Amplitrex AT1000 to guarantee absolute transparency.

Notice: Custom duties and Taxes are the Responsibility of the Buyer in their Country.

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NOS Audio Tubes — Mumbai, India