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#1
Posted to rec.audio.tubes
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Why do tubes get hot?
Yes, I know it sounds like a stupid question. And maybe it should be
stated as "How do tubes get hot?" But, think about it: tubes are full of vacuum. Vacuum is an excellent insulator. What makes the glass hot? The only think I can think of is that the internal components must radiate a lot of infrared light (which, by black body theory, means they must be really hot), and the glass envelopes absorb it. Does anyone here know what actually happens? /kenw Ken Wallewein K&M Systems Integration Phone (403)274-7848 Fax (403)275-4535 www.kmsi.net |
#2
Posted to rec.audio.tubes
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Why do tubes get hot?
You already answered, plain glass is partially "black" to IR.
Ciao Fabio ha scritto nel messaggio ... Yes, I know it sounds like a stupid question. And maybe it should be stated as "How do tubes get hot?" But, think about it: tubes are full of vacuum. Vacuum is an excellent insulator. What makes the glass hot? The only think I can think of is that the internal components must radiate a lot of infrared light (which, by black body theory, means they must be really hot), and the glass envelopes absorb it. Does anyone here know what actually happens? /kenw Ken Wallewein K&M Systems Integration Phone (403)274-7848 Fax (403)275-4535 www.kmsi.net |
#3
Posted to rec.audio.tubes
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Why do tubes get hot?
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#5
Posted to rec.audio.tubes
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Why do tubes get hot?
Thermal conduction, ** ROTFLMAO !! the conduction of heat through metal elements of the tube such as the pins. ** Wacky !!! There is never an absolute vacuum in a tube, ** Really? News to all those dumb electrons. there is always a small amount of gas left in the tube from manufacturing and as a tube is used more gas is released. ** Rocket scientist - no doubt. .......... Phil |
#6
Posted to rec.audio.tubes
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Why do tubes get hot?
wrote: Yes, I know it sounds like a stupid question. And maybe it should be stated as "How do tubes get hot?" But, think about it: tubes are full of vacuum. Vacuum is an excellent insulator. What makes the glass hot? The only think I can think of is that the internal components must radiate a lot of infrared light (which, by black body theory, means they must be really hot), and the glass envelopes absorb it. Does anyone here know what actually happens? /kenw Ken Wallewein K&M Systems Integration Phone (403)274-7848 Fax (403)275-4535 www.kmsi.net |
#7
Posted to rec.audio.tubes
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Why do tubes get hot?
In article .com,
says... wrote: Yes, I know it sounds like a stupid question. And maybe it should be stated as "How do tubes get hot?" But, think about it: tubes are full of vacuum. Vacuum is an excellent insulator. What makes the glass hot? Thermal conduction, the conduction of heat through metal elements of the tube such as the pins. There is never an absolute vacuum in a tube, there is always a small amount of gas left in the tube from manufacturing and as a tube is used more gas is released. Surf my site: http://www.RetroTech.ca There is no problem with heat being radiated through a vacuum. Consider the Sun.... |
#8
Posted to rec.audio.tubes
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Why do tubes get hot?
Don wrote: In article .com, says... wrote: Yes, I know it sounds like a stupid question. And maybe it should be stated as "How do tubes get hot?" But, think about it: tubes are full of vacuum. Vacuum is an excellent insulator. What makes the glass hot? Thermal conduction, the conduction of heat through metal elements of the tube such as the pins. There is never an absolute vacuum in a tube, there is always a small amount of gas left in the tube from manufacturing and as a tube is used more gas is released. Surf my site: http://www.RetroTech.ca There is no problem with heat being radiated through a vacuum. Consider the Sun.... The tube has a hot cathode and anode, and both conduct some heat down the support rods to the glass, so it warms up, but the majority of glass heating is because the heat radiating through the glass is partially absorbed so the glass gets hot. And yes there is always some gas in any tube. The gettering process is continuous through the tube's life, and it is constantly absorbing atoms of gas. Nothing is perfect though, but it doesn't need to be perfect for a tube to work OK. Large transmitter tubes have vacuum pumps connected to evacuate them and prevent the cathodes from bombardment by heavy positively charged molecules and atoms of gas. The sound of gas is much harder to discern when the gas quantity is extremely small, as it is in most tubes that operate wiothin thier spcification, but usually gas causes noise and and if enough gas is present the tube fails to operate correctly. But that's another story; but there us sometimes no shortage of hot gas in the postings sent to r.a.t sometimes. Patrick Turner. |
#9
Posted to rec.audio.tubes
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Why do tubes get hot?
On Tue, 10 Jan 2006 15:12:29 GMT, wrote:
Yes, I know it sounds like a stupid question. And maybe it should be stated as "How do tubes get hot?" But, think about it: tubes are full of vacuum. Vacuum is an excellent insulator. What makes the glass hot? There's your mistake, vacuum is not an insulator, exactly... it allows the passage of electromagnetic waves, which manifests as heat when hitting something and being absorbed, such as glass... go outside and look up - see the big bright ball in the sky? The only think I can think of is that the internal components must radiate a lot of infrared light (which, by black body theory, means they must be really hot), and the glass envelopes absorb it. Black body theory? Like Lola Felana? Does anyone here know what actually happens? yes /kenw Ken Wallewein K&M Systems Integration Phone (403)274-7848 Fax (403)275-4535 www.kmsi.net |
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