Great question. The purple glow is stray electrons and is not unique to the type of tube, but is often unique to the manufacturer of the tube.
Tube Cosmetics
I'm thinking of going "tubular", but have very little experience with tubes. I did try out a Golden Tube SE40 some years back, and one of the things that fascinated me was the purple glow around the Sovtek 5881 power tubes. My question is, do all tubes (for example EL34s) glow purple, or just 5881s? Are there any other tubes that look especially cool lit up? This may sound frivolous, but I think we all secretly covet cool looking stuff! This is a second system, and I want it to be different and fun.
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