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Heatsink USA Extruded aluminum heatsinks, specializing in small custom cut orders

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Old 28th March 2011, 10:28 PM   #41
triode4 is offline triode4  United States
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This is the one by Conrad that many have used.
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Old 28th March 2011, 10:46 PM   #42
triode4 is offline triode4  United States
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The one above is the MF35-151.5 . If Heat sink USA could produce it, I would much rather buy USA products.
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Old 28th March 2011, 11:09 PM   #43
tinitus is offline tinitus  Europe
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what's special about it
looks ordinary to me
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Old 28th March 2011, 11:55 PM   #44
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Just to give a second reference of what several experts consider one of the best available free air convection amplifier heatsink profiles.

The Seifert KL-271 has been recommended for the Leach amp and sevearl PASS amps. There have been past group buys on diyAudio with black anodized coated production running ~$60 each.

There is also a 15" long KL-273, but the cost bump is much greater than the area increase.

Heat sink GP for US & Canada


With the fins oriented vertically, this heatsink measures 12" wide, 8" long, 3.25" thick, and has a 1/2" thick back plate. A singe 8" (200mm) length of this heat sink with black anodize and natural convection is rated for 0.18c/w or approximately 140-150 watts dissipation with a 25c temperature rise.

One of these would comfortably run a stereo Mini-Aleph. Two of these sinks would provide 0.09c/w of cooling that can dissipate approximately 280-300 watts and should be sufficient for a 100wpc Aleph-X monoblock or even an Aleph 2 monoblock.

Raising the heatsink 1"-2" off of the ground is important to start the "chimney effect" pumping of cool floor air through the fin tunnels fueled by heat energy. HEAT and MASS tansfer provides cooling, so you want to move the most cold air possible across the fins. A 6" to 8" high vertical fin heatsink provides enough pump transfer with a reasonable pre-heat inefficiency as you move up the heatsink away from the cool floor air. It is more efficient to use a longer than a wider heatsink beyond 6-8"
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Old 29th March 2011, 12:10 AM   #45
tinitus is offline tinitus  Europe
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I have this one
looks similar, apart from not having the more effective ribbed fins
please dont ask what i payed to get it
but, in its favour, its the most smooth a levelled back I have ever seen
usually you need machining to achieve such high level of precision
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Old 29th March 2011, 12:21 AM   #46
tinitus is offline tinitus  Europe
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I know you can put steel and aluminium together in a kind of 'pressure weld'
its used for welding alu to steel

now, what I would like to see is a heatsink with copper back
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Old 29th March 2011, 12:27 AM   #47
triode4 is offline triode4  United States
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Thanks for the options guys, tinitus, who made your sink?
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Old 29th March 2011, 12:38 AM   #48
tinitus is offline tinitus  Europe
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dont know, we are in a Heatsink USA forum
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Old 30th March 2011, 12:50 AM   #49
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thing is , is that heatsinkusa's 10.080 profile works superb for a pass f5

Click the image to open in full size.

those are 7" high and biased at 1.4 amps never reach 40c in my 66f room and they are on a shelf with only 3" height clearance above .

so again for the naysayers . they WORK !!!

cheers Woody

Last edited by Woody1911a1; 30th March 2011 at 01:10 AM. Reason: math
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Old 30th March 2011, 12:54 AM   #50
triode4 is offline triode4  United States
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Which 10.080 are those. They look like the right size.
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