Try reviewing some of the guitar forums such as PRS forum and Fender discussion page, and Les Paul forum. There is a lot of info on tubes and your question. I have always had a blue glow in my power tubes Fender and Marshalls when they are biased properly. You can get some Bias Probes on ebay fairly inexpensively. Invest in them and you may see some improvement in the peroformance of your equipment. I am in the chicago area and what some of the shops want for biasing your tube amp is ridiculous. Not uncommom to pay $75.00+ in this market. You can buy a bias probe or equivalent for less. Most of the tube amp musicians/techs would love to respond to your questions, at least on the typical guitar amp power tubes. Go for it!
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?