Some of the tubes on my machine show blue florescent neon color on their envelopes. Is there anything wrong with those tubes? Please provide your suggestion(s) and experience.
Yu: What type of tubes are we discussing? A Blue/Purple glow @ the top of the glass globe is usually OK on larger power tubes (I have often found them to be the best sounding), but if it extends lower and seems to cloak the horizontal spacers and/or plates, then you may have a slight leak in the tube which will considerably shorten its life. It is unlikely that "all" of the output tubes would develop leaks unless someone attempted to improperly straighten the pins on them.
The tubes are in blue/purple glow are RCA 6SN7GTB (1 out of 6) and Sovtek 6AS7G (output, 3 out of 10) tubes on my Atma-Sphere amplifier. Also, the 6GC5 (rectifier, I believe) tubes on my preamplifier are the same. Any advice?
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