Power tube at work picture

axhan · 13th May 2011, 07:25 AM

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

the_manta · 13th May 2011, 08:43 AM

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.

DF96 · 13th May 2011, 10:15 AM

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.

axhan · 12:08 PM

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 :

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 ?

rvrazvan · 13th May 2011, 12:23 PM

Quote:

Originally Posted by DF96

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.

rvrazvan · 13th May 2011, 12:25 PM

YouTube - Bach Toccta D-Moll on 1000W Audio Tube Amplifier EL6471

Try this

.

DF96 · 13th May 2011, 12:33 PM

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?

Frank Berry · 13th May 2011, 01:18 PM

300B Tube

axhan · 13th May 2011, 02:41 PM

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

Ty_Bower · 13th May 2011, 03:51 PM

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.

13th May 2011, 07:25 AM	#1
axhan diyAudio Member Join Date: May 2011	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

13th May 2011, 11:54 AM	#4
axhan diyAudio Member Join Date: May 2011	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 : 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 12:08 PM.

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13th May 2011, 08:43 AM	#2
the_manta diyAudio Member Join Date: Nov 2006 Location: Munich, Bavaria	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.

13th May 2011, 10:15 AM	#3
DF96 diyAudio Member Join Date: May 2007	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.

13th May 2011, 12:25 PM	#6
rvrazvan diyAudio Member Join Date: Jul 2010	YouTube - Bach Toccta D-Moll on 1000W Audio Tube Amplifier EL6471 Try this .

13th May 2011, 12:33 PM	#7
DF96 diyAudio Member Join Date: May 2007	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?

13th May 2011, 02:41 PM	#9
axhan diyAudio Member Join Date: May 2011	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

13th May 2011, 03:51 PM	#10
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	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.

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