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Old 13th December 2020, 02:37 AM   #1
cogitech is online now cogitech  Canada
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Tubelab SSE Light Show!
Default Tubelab SSE Light Show!

I mentioned the "Blue Glow" from the 6P3S-E tubes in my SSE in another thread. What I didn't really notice before is that they sort of act like a VU meter, but different areas of the blue glow seem to be associated with different audio frequencies.

Pretty cool, I think:

Tubelab SSE + 6P3S-E Tubes = Blow Glow Light Show - YouTube

Sorry for the bad camera work and sub-standard audio. Try to watch it before the copyright Nazis shut it down.

Last edited by cogitech; 13th December 2020 at 02:40 AM.
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Old 13th December 2020, 02:47 AM   #2
vinylkid58 is online now vinylkid58  Canada
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That's very interesting. I've never seen them do that, but my only experience with the 6P3S-E is push pull, not single ended.

jeff
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Old 13th December 2020, 02:59 AM   #3
jackinnj is offline jackinnj  United States
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Tubelab SSE Light Show!
You could cross-link our polymers with all the UV they are emitting!
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Old 13th December 2020, 03:01 AM   #4
tomchr is offline tomchr  Canada
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Neat! I've had tubes glow blue before but I've never had them act as VU meters.

Tom
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Old 13th December 2020, 03:44 AM   #5
cogitech is online now cogitech  Canada
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Tubelab SSE Light Show!
I can't really imagine why it is happening because my knowledge of how a tube works is rudimentary at best, but I don't recall ever seeing video of this so I thought I would capture it and share it. I am very glad that you have all enjoyed seeing it.
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Old 13th December 2020, 04:28 PM   #6
minerwelder is offline minerwelder  United States
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That is very cool I like your friend in the video he looked interested.
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Old 4th January 2021, 04:47 PM   #7
hareynolds is offline hareynolds  United States
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Default AND Vitamin D

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Originally Posted by jackinnj View Post
You could cross-link our polymers with all the UV they are emitting!
AND an excellent source of Vitamin D, which they say is a mitigating factor in The COVID.
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Old 4th January 2021, 05:23 PM   #8
Tubelab_com is offline Tubelab_com  United States
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It's not actually UV. There are two sources of blue light from a tube.

Some tubes, especially some new production stuff have residual gas left inside, or impurities in construction that get released by heat. These can ionize creating a light that can vary from pink to purple to light blue. This light comes from inside the plate structure, and can cause unintended operation, including a runaway meltdown if it's bad enough.

Some tubes have a very good vacuum and some high speed electrons miss the plate or go through the holes and strike the glass envelope. The glass envelope often contains some impurities, primarily cobalt that can phosphoresce. This glow is on the inside of the glass itself and is harmless. It is also an indication that the tube has a good vacuum inside, but the glow will wane as the tubes wear. I am including a picture of the Russian KT88's in my SSE. This picture was taken when I got the tubes. The glow also danced to the music when the amp was played loud. Ten years later the tubes still work, but no longer glow blue.

I am also posting a picture of a BAD tube that has glow from inside the plate structure. This is a 211 tube running on 1000 volts. The glow caused enough current flow in the wrong direction to blow parts in the amp.
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File Type: jpg glowingkt88s_c.jpg (68.4 KB, 167 views)
File Type: jpg Blue_211.jpg (172.8 KB, 167 views)
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Old 7th January 2021, 10:04 PM   #9
Tubelab_com is offline Tubelab_com  United States
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I found this picture of some Electro Harmonix KT-88's doing the light show dance in a breadboard amp I was testing. Even one of the 6CG7 drivers had a bit of glow going on.
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File Type: jpg P1000690_x.jpg (680.3 KB, 123 views)
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Old 7th January 2021, 10:26 PM   #10
cogitech is online now cogitech  Canada
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Tubelab SSE Light Show!
Some nice glow!

I tried my brand new pair of 6L6GC in my SSE last night and they also have the blue glow. I am a bit surprised by that, actually.
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