Finding a CBS-Hytron 12AX7 Black Plate is like hunting for a ghost because it is easily one of the rarest finds in the vacuum tube world. As an early production masterpiece featuring shiny black plates and a distinctive horseshoe getter, it represents a peak in manufacturing before the industry shifted toward cost-cutting efficiency in the late 1950s.
In terms of performance, this tube is a revelation. It manages to be super transparent while maintaining a level of micro-detail that many other tubes simply gloss over. The low end is tight and rich and provides a solid foundation for any high-fidelity setup. While the mid-range is undeniably musical, it might not quite reach the lush heights of early Sylvania productions, but it more than makes up for it with its overall clarity.
Compared to modern production tubes, there is no contest as this relic puts them all to shame. Even when stacked against the majority of other NOS (New Old Stock) options, the CBS-Hytron maintains a significant edge.
Final Verdict: This is a true 12AX7 holy grail that offers a masterclass in detail and transparency. If you can actually find one, you should buy it without hesitation.
I bought mine 29.00 on eBay 10/2/26. 1700/1800. Tattered label took over 4 years to grab one. Lot of hunting. Their hard to find and the dealers know it. I passed on there offering, big $$$. And there was only a few .
Finding a CBS-Hytron 12AX7 Black Plate is like hunting for a ghost because it is easily one of the rarest finds in the vacuum tube world. As an early production masterpiece featuring shiny black plates and a distinctive horseshoe getter, it represents a peak in manufacturing before the industry shifted toward cost-cutting efficiency in the late 1950s.
In terms of performance, this tube is a revelation. It manages to be super transparent while maintaining a level of micro-detail that many other tubes simply gloss over. The low end is tight and rich and provides a solid foundation for any high-fidelity setup. While the mid-range is undeniably musical, it might not quite reach the lush heights of early Sylvania productions, but it more than makes up for it with its overall clarity.
Compared to modern production tubes, there is no contest as this relic puts them all to shame. Even when stacked against the majority of other NOS (New Old Stock) options, the CBS-Hytron maintains a significant edge.
Final Verdict: This is a true 12AX7 holy grail that offers a masterclass in detail and transparency. If you can actually find one, you should buy it without hesitation.
I bought mine 29.00 on eBay 10/2/26. 1700/1800. Tattered label took over 4 years to grab one. Lot of hunting. Their hard to find and the dealers know it. I passed on there offering, big $$$. And there was only a few .