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Apologies for the barrage of questions but I am new to the the tube world and every little thing gives me concern.Yesterday, I noticed that glass cover of all the 4 power tubes were giving a blue glow in some areas. This was not inside the tube but on the glass shell. It was noticed only when the room was dark. The blue colour could not be seen when I put on the lights. Apart from this everything seemed normal in the way the tubes looked and sounded.
Is this normal or is there a problem. The amp is a Cayin A88T with stock tubes.
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Do a search for "blue glow" and you will have a few hundred posts to enjoy.
Thanks Sherlock. Should have checked it in the first place before panicking.
It is normal. It actually is a symptom of some tubes that have a good, high vacuum. I like the way they look too!
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