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Old 13th December 2010, 08:42 PM   #101
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Quote:
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My point is that radiation and convection are likely to be worse with a cooler than without. A cooler can only improve things by using conduction, which requires good contact all over the glass. It seems that this has only recently been achieved.
If that was the case it seems unlikely I'd ever have seen any temperature reductions, something I emphatically have, and repeatedly.
This is a many faceted problem, not one 'resolved' by over-simplified views.
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Old 13th December 2010, 08:49 PM   #102
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A black surface (the best option) immediately outside the glass could radiate up to half its thermal loss back into the valve.
It can't. A first, it has 2 sides. Second, area of anode is much smaller than area of heatsink. Third, unlike anode heatsink is exposed to an air convection.

Glass is cooled also, due to chimney effect that accelerates air flow.
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Old 13th December 2010, 08:51 PM   #103
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Default The relative emissivity of specular and matte surfaces

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The matter is in coefficient of blackness.

Glass and charcoal of the same temperature look differently on the screen.
If you are of a mind something of an article on this would be helpful to many I'm sure
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Old 13th December 2010, 08:59 PM   #104
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Originally Posted by Mother of PEARL View Post
If you are of a mind something of an article on this would be helpful to many I'm sure
Studying this many years ago I remember lots of surprises... But what I remember, is a fraction, mostly conclusion. Like, no matter how black some material looks, it's absorption and radiation of infrared rays is not always correlated with visual blackness. Glass have very low coefficients of absorption and radiation. Different metals added to glass vary coefficients of absorbtion and radiation of IR, while in visual band of spectrum it may be not so obvious.

I dream of that IR camera that is used in semiconductor industry, but I can't afford it now, unfortunately.
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Old 13th December 2010, 09:12 PM   #105
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It can't. A first, it has 2 sides. Second, area of anode is much smaller than area of heatsink. Third, unlike anode heatsink is exposed to an air convection.

Glass is cooled also, due to chimney effect that accelerates air flow.
Yes, it has two sides. That is why I said half radiation could go back in. In practice convection and fins on the outside would mean that less than half would go back. Which radiates most into a valve: a hot black body ('cooler') just outside the glass, or a cooler grey body (chassis, transformer?) some distance way? The area of the anode is irrelevant, as much of the incoming radiation will be absorbed in the glass.

Glass is cooled by the chimney effect with a loose 'cooler' which has an air gap big enough not to restrict flow. Such a 'cooler' cannot use conduction. You choose: chimney or conduction?
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Old 13th December 2010, 09:18 PM   #106
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Quote:
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You choose: chimney or conduction?
I will choose what allows me to dissipate more power on anodes of 6С19П tubes.
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Old 13th December 2010, 09:27 PM   #107
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I will choose what allows me to dissipate more power on anodes of 6С19П tubes.
OK, how about this: you pay the postage and I'll give you a couple of coolers?
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Old 13th December 2010, 09:31 PM   #108
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OK, how about this: you pay the postage and I'll give you a couple of coolers?
Let's try!

Sending PM.
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Old 13th December 2010, 09:33 PM   #109
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I think some "Tubelab" type tests till destruction are going to be required to find out what cooling method works best for Wavebourn. Please have your camera ready so we can see the results! But it seems to me that a glowing plate is the ultimate limit, and no matter how one cools the glass, it is not going to make much difference there. Anti-photons? Cool rays? Cold dark matter circulation cooling? Sterile neutrinos? Parabolic mirror pointed out into the darkness of space?
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Old 13th December 2010, 09:39 PM   #110
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I think some "Tubelab" type tests till destruction are going to be required to find out what cooling method works best for Wavebourn. Please have your camera ready so we can see the results! But it seems to me that a glowing plate is the ultimate limit, and no matter how one cools the glass, it is not going to make much difference there. Anti-photons? Cool rays? Dark matter evaporation cooling?
Sure, I will take pictures! 6С19П looks like have nickel alloy anodes, at least they look exactly like ГУ-50 anodes, so I suspect them to be hard to kill.
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