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Old 17th March 2004, 06:57 PM   #1
Brap is offline Brap  United States
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Default BLue hue

Probably nothing to worry about, but after about an hour or so, I 'm getting a slight blue hue from my 2A3 tubes on one channel alone of a 2 channel amp. I thinking it's slight manufacturing debris in the tubes?

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Old 17th March 2004, 07:06 PM   #2
Colt45 is offline Colt45  Serbia
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On the glass, or in the elements?
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Old 17th March 2004, 07:09 PM   #3
Brap is offline Brap  United States
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It's on the glass portion, near the "shoulder" if that 's the correct terminology
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Old 17th March 2004, 08:48 PM   #4
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Perfectly fine. I even have a 6SN7 that does it.

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Old 17th March 2004, 11:09 PM   #5
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Sounds perfectly normal Enjoy
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File Type: jpg glow.jpg (12.5 KB, 221 views)
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Old 17th March 2004, 11:38 PM   #6
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Hi,

Maybe someone should explain, once again, where the blue hue comes from and how it will affect the useful life of a tube?

Don't ask, it won't be me doing the 'splaining again.

Cheers,
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Old 18th March 2004, 01:28 AM   #7
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Quote:
Originally posted by Brap
It's on the glass portion, near the "shoulder" if that 's the correct terminology
Quote:
Originally posted by fdegrove
Maybe someone should explain, once again, where the blue hue comes from and how it will affect the useful life of a tube?
Yeah yeah, blue glow on glass is perfectly fine, blue/purple/white glow from inside the structure might not be. I have some Russian 6L6s (erm.. 6pi3C-E or whatever) where the plate coating fluoresces light blue where the electron beam strikes it. I can barely see (due to visual obstructions and low current) the same in Hept'AU7's 12AU7s too. The real thing that you should worry about is a discharge between the cathode and plate, not a generic glow from inside.

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Old 18th March 2004, 01:41 AM   #8
Duo is offline Duo  Canada
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Yeah, this is pretty simple. There are often just impurities in the glass or elsewhere in the tube that are easy to ionize and also emit light when this occurs. If the color shows right on the glass and not just floating inside the tube, then I see no problem.

I, like others here, have had tubes with a light glow on the glass or plates. They usually give me plenty of fine operation just like a tube that doesn't glow unusually.
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Old 20th March 2004, 04:25 AM   #9
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I've got one set of Philips/Siemens EL34's that do this.

I've never observed any sonic difference or penalty from having a blow glow from a set of tubes, but I've got to say thay look damn fine when listening to music in a darkened room!
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