2 thoughts on “Sylvania JHS 12at7 Gray Plates 2 mica”
These Sylvania JHS 12AT7 Gray Plates 2 mica are an absolute revelation, especially considering they were a lucky eBay find at $16 for three. These tubes feature a unique construction with only 2 mica and a highly unusual heater connection on the top of the second mica, along with plates that aren’t the typical wing shape for a 12AT7. The plate structure actually resembles the Telefunken ECC801S, but these are clearly marked “Made in USA,” and they deliver a tonal delicacy that is simply out of this world. When compared to the Telefunken 12AT7, the Sylvanias offer significantly more detail, while the Amperex 12AT7 is very close but lacks a bit of the Sylvania’s speed. Even when stacked against the reputable JHS 12AT7 triple mica, these 2-mica versions are phenomenal.
* Construction: Unique 2-mica design with unusual plate structure and heater connections * Tonal Character: Incredible delicacy and detail that outshines top-tier European glass * Dynamics: Exceptional speed and transparency, surpassing the Amperex equivalents * Value: An unbelievable steal if you can find them, though they are quite rare
Final Verdict: The Sylvania JHS 12AT7 Gray Plates 2 mica are highly recommended as a top-tier performer that provides a level of detail and musicality that is hard to match at any price.
Finally, I had the opportunity to try this quite rare tube (in a preamp section) since i found one on ebay for $14. To express my first impressions I can use only two words – fast and solid! I have never heard fastest 12AT7 tube than this one, at the same time it is very musical and you cannot hear any sort of congestion or smearing throughout the whole frequency range. It is also the 12AT7 with the most upfront sound with very deep and solid bass and completely natural midrange.
The treble extremes are special story, it rivals Sylvania JHS black plates 3 mica in that region and it has even beter 3D effect. I found my listening room simply overwhelmed with tons of details and so far unheard sounds…
Warmth is not its first name but this is the price paid for speed and magical treble delicacy. Personally, it creates a bit more bass output in my system so I decided to revert to RT 12AT7 for its more relaxed and bass-balanced sound. Nevertheless, with some other output tubes no doubt I`ll use it again, that kind of sound could not be forgotten so easily! HIGHLY RECOMMENDED with careful system matching.
These Sylvania JHS 12AT7 Gray Plates 2 mica are an absolute revelation, especially considering they were a lucky eBay find at $16 for three. These tubes feature a unique construction with only 2 mica and a highly unusual heater connection on the top of the second mica, along with plates that aren’t the typical wing shape for a 12AT7. The plate structure actually resembles the Telefunken ECC801S, but these are clearly marked “Made in USA,” and they deliver a tonal delicacy that is simply out of this world. When compared to the Telefunken 12AT7, the Sylvanias offer significantly more detail, while the Amperex 12AT7 is very close but lacks a bit of the Sylvania’s speed. Even when stacked against the reputable JHS 12AT7 triple mica, these 2-mica versions are phenomenal.
* Construction: Unique 2-mica design with unusual plate structure and heater connections
* Tonal Character: Incredible delicacy and detail that outshines top-tier European glass
* Dynamics: Exceptional speed and transparency, surpassing the Amperex equivalents
* Value: An unbelievable steal if you can find them, though they are quite rare
Final Verdict: The Sylvania JHS 12AT7 Gray Plates 2 mica are highly recommended as a top-tier performer that provides a level of detail and musicality that is hard to match at any price.
Finally, I had the opportunity to try this quite rare tube (in a preamp section) since i found one on ebay for $14. To express my first impressions I can use only two words – fast and solid! I have never heard fastest 12AT7 tube than this one, at the same time it is very musical and you cannot hear any sort of congestion or smearing throughout the whole frequency range. It is also the 12AT7 with the most upfront sound with very deep and solid bass and completely natural midrange.
The treble extremes are special story, it rivals Sylvania JHS black plates 3 mica in that region and it has even beter 3D effect. I found my listening room simply overwhelmed with tons of details and so far unheard sounds…
Warmth is not its first name but this is the price paid for speed and magical treble delicacy. Personally, it creates a bit more bass output in my system so I decided to revert to RT 12AT7 for its more relaxed and bass-balanced sound. Nevertheless, with some other output tubes no doubt I`ll use it again, that kind of sound could not be forgotten so easily! HIGHLY RECOMMENDED with careful system matching.