Interesting tube. I tried to find info on them. What I read is they are from a unknown plant in china. Then matched and graded.I've received both Select and Reserve versions of the Ray Tubes 6SN7's to try in the BAT VK80i and the Viva Solista.
Here is a picture of the Reserve versions being run-in.
You can see they are a different shape and color from the traditional Russian ones that are more slender and completely flat sided.
View attachment 139276
Black Ypsilon....gotta be the best looking hifi gear.VPS 100 MK 2View attachment 139659
Black Ypsilon....gotta be the best looking hifi gear.
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