Heatsinks for tubes?

Wavebourn · 9th December 2010, 08:21 PM

Does anybody know if it is possible to source heatsinks for tubes?

Rattlehead · 9th December 2010, 08:43 PM

I remember someone putting tubes under water (obviously with the leads outside) to cool them down.

pedroskova · 9th December 2010, 09:09 PM

Pearl tube coolers

SGregory · 9th December 2010, 09:22 PM

second the pearls

Bigun · 9th December 2010, 09:25 PM

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 ?

smoking-amp · 9th December 2010, 09:36 PM

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.

aardvarkash10 · 9th December 2010, 09:39 PM

hell, how do you see the glow if its wrapped in a heatsink???

Wavebourn · 9th December 2010, 09:45 PM

Quote:

Originally Posted by pedroskova

Pearl tube coolers

Thanks! Looks cool...

Matt.B.H. · 9th December 2010, 10:03 PM

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.

Wavebourn · 9th December 2010, 11:11 PM

Quote:

Originally Posted by Matt.B.H.

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

9th December 2010, 09:22 PM	#4
SGregory Tubie Noobie diyAudio Member Join Date: Apr 2003 Location: Southern Tier NY	second the pearls __________________ Living Life Doing the Waltz in 4/4 meter.

9th December 2010, 09:25 PM	#5
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	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 ? __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

9th December 2010, 09:36 PM	#6
smoking-amp diyAudio Member Join Date: Dec 2001 Location: Hickory, NC	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. __________________ Ohms Law V = I R

9th December 2010, 09:39 PM	#7
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	hell, how do you see the glow if its wrapped in a heatsink??? __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

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9th December 2010, 08:43 PM	#2
Rattlehead diyAudio Member Join Date: Sep 2010 Location: Spain	I remember someone putting tubes under water (obviously with the leads outside) to cool them down.

9th December 2010, 09:09 PM	#3
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	Pearl tube coolers

9th December 2010, 10:03 PM	#9
Matt.B.H. diyAudio Member Join Date: Jul 2009 Location: Cheltenham	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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