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 elevick

Well, since tubes are supposed to be a vacuum, why should you want any extra gas? If it were desireable, everyone would do it, not just a few rare cases.