Vacuum Tube Valley magazine in the 12ax7 shout out rated this tube the highest of all other tubes.
“sonicly between the Telefunken’s tremendous dynamics/speed/ details and the long plate Mullard’s/Amperex’s warmth/rich timbres/image density.” Read
“These are the best sounding 12AX7 tubes I’ve ever heard and for the price there is nothing that comes close in clairity and gain then these do in my opinion.” Store Reviews
Upon testing the Mazda 12AX7 Silver/Chrome Plate, I was immediately struck by its performance, especially since documentation on this specific variant is so scarce. My particular specimen is a rare 1958 production featuring a circular hole in the plate rather than the standard slit.
The standout feature of this tube is the soundstage; it is massive, surpassing even the legendary Telefunken in both width and depth. It creates an immersive “mid-row” experience that places you directly inside the music. Sonically, it is highly detailed and airy, paired with a surprising bass slam that gives it plenty of authority. While it isn’t a “warm” tube by traditional standards, it offers a level of clarity and speed that is hard to match.
A Brief History of Mazda Miniature Tubes
Mazda (specifically Mazda-Belvu in France) was a powerhouse in European tube manufacturing throughout the mid-20th century. While they produced a wide array of consumer glass, their miniature dual-triodes (like the 12AX7/ECC83) became legendary for their rigorous French military and industrial specifications. During the 1950s and 60s, Mazda competed directly with Philips/Mullard and Telefunken, often implementing unique structural changes to meet specific requirements for low noise and high durability.
The Purpose of Chrome Plates
The “Chrome” or “Silver” plates found in these Mazda tubes are actually nickel-plated steel or high-purity nickel. Unlike the standard grey carbonized plates found in most tubes, these shiny plates were used to reduce outgassing and maintain a higher vacuum over the tube’s lifespan. From a sonic perspective, many enthusiasts believe the silver plate construction contributes to the tube’s transparency and high-end extension, as the material lacks the damping characteristics of heavy carbon coating, leading to a faster, more “crystalline” sound.
Final Verdict: This is a polarizing, top-tier performer. If you value surgical precision, holographic imaging, and deep bass over lush mid-range warmth, this is a must-try tube that may just unseat the Telefunkens in your collection.