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Old 10th April 2013, 10:57 PM   #1
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Default Where to buy heatsink for power amp?

I think this has been answered other times but I was unable to find the post I saw long long time ago.
I need to buy heat sinks in the USA.
I remember that there was a post with very good links to distributors who have several profiles.

Can anybody help here?

I am going to build a heavily class A biased power amp and I would like to get some good efficient heat simnk and build chassis around it for testing.

Thanks.
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Old 11th April 2013, 12:51 AM   #2
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heatsinks? in the USA?

Extruded Aluminum Heatsinks from HeatSinkUSA

They are not finished and the sections I bought in the past were not totally flat, but still well worth the money.
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Old 11th April 2013, 01:09 AM   #3
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Quote:
Originally Posted by discrete View Post
heatsinks? in the USA?

Extruded Aluminum Heatsinks from HeatSinkUSA

They are not finished and the sections I bought in the past were not totally flat, but still well worth the money.
How can a heat sink be worth the money if it is not flat? Was the problem fixed and how distorted were they?
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Old 11th April 2013, 11:03 AM   #4
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Originally Posted by WithTarragon View Post
How can a heat sink be worth the money if it is not flat? Was the problem fixed and how distorted were they?
Yes I agree with you! If heat sink is not flat it is almost useless especially if trying to dissipated a ton of heat.
Any minimum imperfection on thermal transfer can lead to troubles.

However I remember a post with distributors that have different profiles, but I can't find it!!
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Old 11th April 2013, 01:44 PM   #5
AndrewT is offline AndrewT  Scotland
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If I remember correctly, Heatsink USA announced a release date for his biggest sink.
He came back to tell us it was delayed due to a production problem, i.e. lack of flatness across the width of the extruded profile.

I think they were released after they had solved that production problem.
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Old 11th April 2013, 01:46 PM   #6
AndrewT is offline AndrewT  Scotland
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A radius of a few metres across the backplate is not a problem if you are fixing devices that are only 20mm wide.
You will be well resourced to be able to measure the out of flatness across 20mm.
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Old 11th April 2013, 01:55 PM   #7
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Originally Posted by AndrewT View Post
A radius of a few metres across the backplate is not a problem if you are fixing devices that are only 20mm wide.
You will be well resourced to be able to measure the out of flatness across 20mm.
Andrew: I don't disagree. The post claimed it was not "flat". That is ambiguous. It was also not clear whether that was an early production run that has since been sorted out. My question is a reasonable one.
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Old 11th April 2013, 02:29 PM   #8
PMI is offline PMI  United States
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I recently got about a dozen pieces from this company.

4 pieces were large-ish, 10 inches by 4 inches. The fee to cut them to order for all of those was only $5 (!!!). As mentioned above, not "finished", so the edges of the cut are very (VERY) sharp, and there were a couple uneven bits at the end of the cut (perhaps that was what was referred to in the post above). If doing this by hand, you just need a bit of patience, and some sandpaper to take the sharp edge off. (they do offer custom machining, but I have not tried it)

All perfectly flat, measured with some kind of shop tool while they were being drilled/tapped and machined for me. No issues whatsoever. Exactly as advertised, and shipped very quickly (to me, anyway).

Very happy with the result at the price!
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Old 11th April 2013, 02:36 PM   #9
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Parts Express has these...I haven't tried them:

Aluminum Heat Sink Kit 109.3 x 58.5 x 18mm 320-3280

Aluminum Heat Sink Kit 58.5 x 58.5 x 18mm 320-3281
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Old 11th April 2013, 02:43 PM   #10
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Quote:
Originally Posted by tubelab.com View Post
They seem to be rather small heatsinks for a class-A amplifier...
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