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Old 13th May 2011, 08:25 AM   #1
axhan is offline axhan  Belgium
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Default Power tube at work picture

Hi,

In order to complete a school work about amplifiers, I need a picture of a power amp at work where you can see the electron flux. I google'd but didn"t find any, could you deliver one if you own it ?

Thanks in advance

A
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Old 13th May 2011, 09:43 AM   #2
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How should it look like ?
Should it be some kind of drawing ? (like that: File:Elektronenroehre real.png ? Wikimedia Commons) You can't make the electron flux visible in a vacuum tube unless you put some kind of gas into it.
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Old 13th May 2011, 11:15 AM   #3
DF96 is offline DF96  England
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Then the gas will stop it working. Electrons are invisible. Apart from the heater glow and possibly a front panel light, a working amplifier looks exactly the same as a non-working amplifier.
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Old 13th May 2011, 12:54 PM   #4
axhan is offline axhan  Belgium
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Yes I may have been a bit fast by saying electrons, I should have simply said a picture of a tube "working", if it is visible. I found this picture on wikipedia : Click the image to open in full size.
But it isn't really what I imagined, I had rather thought about a sort of blue ondulation, a bit in the same way as a plasma lamp (but not as heavy of course).

Edit : I just remembered about Thyratron (Video), can't we have a similar phenomenon in audio applications ?

Last edited by axhan; 13th May 2011 at 01:08 PM.
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Old 13th May 2011, 01:23 PM   #5
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Quote:
Originally Posted by DF96 View Post
Then the gas will stop it working. Electrons are invisible. Apart from the heater glow and possibly a front panel light, a working amplifier looks exactly the same as a non-working amplifier.
Not really. Some tubes exibit some blue glow(ionisation).
You could try to modify an tube(injecting some neon gas in it) but that's no easy task.
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Old 13th May 2011, 01:25 PM   #6
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Old 13th May 2011, 01:33 PM   #7
DF96 is offline DF96  England
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The blue glow seen in some good tubes is fluorescence of the glass. Nothing to do with gas. I'm not sure if the OP wants a genuine picture of a tube working (which will not show much) or some 'artistic' picture giving a false impression. Is your project for arts or science?
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Old 13th May 2011, 02:18 PM   #8
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Old 13th May 2011, 03:41 PM   #9
axhan is offline axhan  Belgium
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Not at all, the purpose is to show that, in opposition with preamp tubes where you cannot see anything except heating, some power tubes have some visual effect and a picture illustrating it would be nice.
The picture which was just posted by Frank Berry fits fine indeed
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Old 13th May 2011, 04:51 PM   #10
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Franks photograph is quite amazing. I've never seen a photo where one could so clearly see the image of the plate structure projected onto the surface of the glass. That's really neat.

I've always liked this illustration of a beam power tube. I believe it came out of one of the old RCA handbooks. It shows the electron flux fairly well, I think. Too bad it's only an illustration, and not an actual photo. The tricky thing is, you can't really see the actual electrons themselves. They're much too small.

Click the image to open in full size.
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