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Old 16th March 2005, 01:59 PM   #1
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Default 6sn7GT

How do you identify a carbonized tube? like a 6sn7GT,
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Old 16th March 2005, 02:44 PM   #2
SY is offline SY  United States
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The inside of the glass envelope is opaque black or dark gray.
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Old 16th March 2005, 08:44 PM   #3
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SY, what's the purpose of the carbonization?
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Old 16th March 2005, 08:59 PM   #4
Sherman is offline Sherman  United States
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Quote:
Originally posted by serengetiplains
SY, what's the purpose of the carbonization?

It puts the head on a pint of beer!

Oh, wait... that's carbonation . Never mind.
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Old 16th March 2005, 09:08 PM   #5
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Quote:
Originally posted by serengetiplains
SY, what's the purpose of the carbonization?

It absorbs the stray electrons that make it out of the active structure in the tube and keeps them from causing secondary emission off the glass that would scatter back into the tube anode causing distortion. The improvement is measureable.

It also makes tubes, especially like KT-66 less atractive to look at IMO.
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Old 16th March 2005, 10:48 PM   #6
SY is offline SY  United States
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What rcavictim said!

In Morgan Jones's 6SN7 measurements, the carbonized envelope types were the clear winners (of course, he didn't have any 5692s to try). It's hard to draw a conclusion from a single data set/example, but it's at least suggestive.

The look is the only downside to my beloved EL37s.
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Old 16th March 2005, 11:57 PM   #7
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Hi,

Quote:
(of course, he didn't have any 5692s to try).
Just imagine what a 5692 would measure if it would have had a carbonized glass envelope....

If I'd be asked to make a vote on how audio tubes should be made, carbonized glass envelopes would be high on my wish list together with those black plates (molybdenum?).

I've almost always found those to sound markedly better than the more ordinary versions but YMMV.
No idea what the reduction in distortion actually is, I doubt it would be big, but it's sure is audible.

Cheers,
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Old 17th March 2005, 01:53 AM   #8
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Thank you for the information thats what I thought but was not sure,,, And a nice Guiness is good too!
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Old 17th March 2005, 08:31 AM   #9
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Guinness uses nitrogen... There's a useless fact for you.
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Old 17th March 2005, 11:10 AM   #10
SY is offline SY  United States
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How horribly disappointing. That's like finding out that Bollinger uses a Charmat process.
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