(13 votes, average: 4.46 out of 5)
Loading...“… having a wonderful 3D sense of space and it does!! The stage seems larger than
life. The only flaw it might have would be on bright systems it tends
to have a happy high end, but I can live with it.” Read
“Beautiful punch/dynamics, with the leading edge of the Telefunken’s without the “etch”. The body of the harmonic is not quite as full as the long plate Mullard’s/Amperex’s but more body then the Telefunken’s. “ Read
“…Mazda had an extreme makeover kind of outward beauty and a similarly aesthetically pleasing tonal beauty with perhaps a smidge more bass and impact than the Amperex…” Read
Initially, I completely dismissed the Mazda 12AU7 Gray Plate. Having previously experienced the Mazda 12AX7, I found this version to be a bit of a “bright” performer—initially too sharp for my primary rotation of vocal jazz. However, my perspective shifted entirely when I began listening to live recordings by Patrick Bruel. These albums, rich with complex instrumental arrangements and concert hall acoustics, demanded a level of clarity that my other tubes simply weren’t providing.
When I gave the Mazda a second chance, the results were stunning. The soundstage and transparency it delivered were virtually unmatched in the 12AU7 family. It has a unique way of projecting the vocals slightly ahead of the instrumentation, creating a pinpoint focus that makes the performance feel intimate yet expansive. To be sure of what I was hearing, I compared it against nearly 25 other tubes. While the CBS and Sylvania JHS offered stiff competition, they couldn’t replicate the 3D holographic imaging or the “being there” realism of the Mazda. While I still reach for a WH or JHS for pure vocal jazz, the Mazda reigns supreme for instrumental and live recordings. The only tube that surpassed it in my testing was the RCA 6SN7 Red Base, which offered slightly more bass weight and vocal projection.
A Brief History of Mazda France Manufacturing
The “Mazda” brand in France was the primary trademark of the Compagnie des Lampes, established in 1921. Unlike many other brands that simply rebranded tubes from major conglomerates, Mazda France operated legendary factories like the one at Clichy. Throughout the mid-20th century, they developed a reputation for high-precision engineering, often collaborating with or being influenced by Philips/Mullard designs, yet maintaining a distinct “French sound” characterized by high-end extension and exceptional detail. By the 1950s and 60s, their silver and gray plate variations became staples in European radio and military equipment, prized for their longevity and low noise floors. Today, vintage Mazda tubes from the French factories are highly sought after by audiophiles specifically for their ability to resolve fine micro-details that other vintage glass might soften.
Final Verdict
The Mazda 12AU7 Gray Plate is an absolute powerhouse for listeners who crave transparency and a wide, three-dimensional soundstage. While it may be a touch bright for “warmth-only” systems, its ability to bring a live concert to life makes it a must-try component for any serious tube roller.