1 tube glowing blue?


I just replaced the SED 6550 tubes in my VTL MB450s. In 1 amp there is a tube that is glowing blue. Is there something wrong with it? Dont want it to blow.
pal
Should be OK. Results from certain gasses appearing in the tube (i.e., not complete vacuum)
It's normal, I called SED a while back, they said not to worry.

I have two quads of SED KT-88's, they all have a blue glow, plus they sound great.
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 !