1 tube glowing blue?

There is a good explanation of the blue glow in a FAQ on the Audioasylum Forum. I recommend you read it. Blue glow is good, and pretty as well!

I like Blue Glow.....It looks very beautiful when the lights off. I wish all my tubes glowing Blue :-) !!!!!

Some of the Blue Glow that I have in my amp. are pulseing with the music !

More specifically:

"The glow is caused by the electrons striking the plate, volatizing the surface, and dislodging atoms of nickel. High speed barium-strontium electrons from the filament collide with the atom, tearing off electrons, ionizing them and causing a deep blue color even in a well evacuated tube. The glow is a function of the plate voltage and the number of gas molecules in the envelope. In a good vacuum there are still billions of molecules. The electrons do not cause trouble because they all return to the positively charged plate. The size of the glow also varies with plate voltage and is not the same for each tube: it can vary from not discernable to very obvious even in daylight."

Pawlowski, I couldn't have said it better !

Thanks for the info. I can now listen without waiting for a POP!