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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?
saxo

Showing 1 response by saxo

saxo OP
98 posts
 
I found the following on Audioasylum.

http://users.erols.com/bluestat/FAQ/blue_glow.html

This indicates that the blue glow is normal and, as Viggen said, actually indicates a tube which is desirable.

Unless others disagree.......
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