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  1. Here is an interesting find for your collection. The Hitachi 12AX7 with long black plates and a D-getter is an exceptionally rare specimen; in fact, only one has surfaced on eBay in the last 90 days. The sonic profile of this little treasure sits comfortably between the GE 5751 and the legendary Tung-Sol 12AX7 black plates.

    While it shares the high transparency of both those tubes, it occupies a unique middle ground—it is not quite as warm as the Tung-Sol, yet not as strictly neutral as the GE. One of its standout features is the great soundstage, which ranks among the better examples in the entire 12AX7 family. It remains quite musical, and although it doesn’t fully reach the heights of the Tung-Sol black plate—widely considered one of the rarest and best-sounding 12AX7s in existence—this Hitachi performs admirably. I would be more than happy to use it in place of the Tung-Sol. This tube comes RECOMMENDED.

    Why Hitachi Produced 12AX7 Tubes

    Hitachi entered the vacuum tube market as part of Japan’s massive industrial push to rebuild and compete globally in the electronics sector following World War II. During the 1950s and 60s, Japanese manufacturers like Hitachi established technical partnerships with American giants like RCA and GE.

    Hitachi produced 12AX7 tubes to supply the booming global demand for high-fidelity audio equipment and guitar amplifiers, as well as for use in their own sophisticated test equipment and early computers. Because they were often competing for lucrative export contracts, Hitachi frequently over-engineered their tubes—using high-quality materials like long black plates—to ensure they met or exceeded the performance of the Western brands they were modeled after.

    Final Verdict
    The Hitachi 12AX7 Long Black Plate is a rare and versatile performer. It offers a superb soundstage and high transparency that bridges the gap between clinical neutrality and vintage warmth. For those who cannot find or afford a Tung-Sol black plate, this Hitachi is a world-class alternative that holds its own in any high-end circuit.

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