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Old 9th December 2010, 08:21 PM   #1
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Default Heatsinks for tubes?

Does anybody know if it is possible to source heatsinks for tubes?
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Old 9th December 2010, 08:43 PM   #2
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I remember someone putting tubes under water (obviously with the leads outside) to cool them down.
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Old 9th December 2010, 09:09 PM   #3
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Pearl tube coolers
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Old 9th December 2010, 09:22 PM   #4
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second the pearls
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Old 9th December 2010, 09:25 PM   #5
Bigun is offline Bigun  Canada
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maybe you don't need to heatsink the tube - they cool by radiation because the plate in in a vacuum so you just need to surround the tubes with cool surfaces to absorb the radiated heat ?
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Old 9th December 2010, 09:36 PM   #6
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Heatsinks on tubes may actually make them run hotter, since they intercept the normally radiated radiant heat and have poor thermal contact with the glass. Probably were used to keep the surrounding components from getting hot by converting all the radiant heat to vertical convected hot air instead. A fan could help, but that would likely work even better without the heatsink in the way.
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Old 9th December 2010, 09:39 PM   #7
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hell, how do you see the glow if its wrapped in a heatsink???
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Old 9th December 2010, 09:45 PM   #8
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Quote:
Originally Posted by pedroskova View Post
Thanks! Looks cool...
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Old 9th December 2010, 10:03 PM   #9
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Morgan Jones wrote about valve heat sinks in Building Valve Amplifiers (The blue book)

I dont have the book to hand at the moment but I think I remember him quoting some source saying that just keeping the envelope temperature down can extend life.

I can see that radiated heat from the anode would be partly absorbed by the glass because it does not completely pass IR. Also the black anodising on the heatsink will absorb the rest of the IR and as long as it has enough surface area for conduction/convection to the air will prevent heating of other devices around it.

I think I saw some the same as in the book at Ask Jan First. The Pearl ones look good if a bit pricey.

What tubes are you cooling Wavebourn?

Matt.
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Old 9th December 2010, 11:11 PM   #10
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Quote:
Originally Posted by Matt.B.H. View Post

What tubes are you cooling Wavebourn?
6С19П

It looks better above SOA, on higher than specified voltage, with higher load resistance than usual.

http://cqham.ru/tubes/soviet/pdf/6s19p.pdf
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