It is not a concern. If anything, it indicates a tube that has less gas in it. The elements may glow orange, but the blue is more of a fluorescent glow in the whole tube in the dark. See audioasylum--the tube guys there know this is true.
Blue Gas in Tubes - Why? Is it Bad?
My friend's Svetlana KT88s glow with blue gas. He says that it doesn't mean anything, but I'm not so sure. He claims that he has seen this in Svet KT88s from different sources, including Upscale Audio.
I have heard that companies like Audio Research screen out tubes for "gas". Is this the same thing?
Does this affect the life or the performance of the tube?
I have heard that companies like Audio Research screen out tubes for "gas". Is this the same thing?
Does this affect the life or the performance of the tube?