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Tube Maze
Guides and reviews of vacuum tubes and tube equipment
The Mullard 12AU7 Long Plate (Mitcham) is a rare gem that often hides in plain sight. Originally mistaken for a standard Blackburn production in a bulk eBay lot, this tube reveals its true identity through the “R” date code, confirming its origin from the Mitcham plant—a facility that produced these for only a very brief window. While it shares the physical architecture of its Blackburn cousins, it is distinguished by a unique O-getter with a single support rod.
In terms of performance, this Mitcham variant is nothing short of breathtaking. If the Blackburn version is known for being rich and creamy, the Mitcham takes those qualities to the absolute limit. It offers a massive soundstage and exquisite instrument separation that makes every recording feel intimate. The low end is anchored by superb bass, while the midrange remains incredibly luscious.
Listeners should be aware of a distinct high-frequency roll-off, which occurs even earlier than on other Mullard versions. However, this characteristic makes it the ultimate choice for melancholy or “depressing” tracks. For a transformative experience, pair this tube with Melody Gardot’s “Deep Within the Corners of My Mind”; the synergy is simply phenomenal.
Final Verdict: An elite, highly recommended tube for those seeking the pinnacle of warm, dark, and soulful British audio engineering.