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Old 25th April 2005, 05:01 PM   #1
Eric is offline Eric  United States
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Thumbs up North America Heat Sink Group Purchase

Hi Everyone,

I have found a heat sink distributor for Seifert extrusion number KL-271:

Click the image to open in full size.

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.

The distributor has a minimum order of 10 pieces, which is more than most people might want, so I have inquired about the possiblity of a group purchase and different quantities and price points.

To give you an idea of cost, the unit price for 10 of these heatsinks is approx $60 each (not including shipping).

I will be able to provide more details shortly...

Any interest?? I will post more details shortly, and if there is sufficient interest, I'll set up a wiki...

Eric
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Old 25th April 2005, 05:37 PM   #2
joster is offline joster  United States
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I'd probably be interested. Is that a good price, or are you hoping it will go down significantly with more units?
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Old 25th April 2005, 05:49 PM   #3
gengis is offline gengis  United States
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I am interested in at least 2, could be up to 6 depending on price vs. quantity.


Who is the distributor? Does have a website?
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Old 25th April 2005, 05:56 PM   #4
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I'd be interested in four pieces, if the price can be brought down with higher quantities.

I had purchased 12 pieces of extruded heatsinks from M&M Metals for about $300 shipped. The heatsinks were 8" in length, 6.695" tall with alternating 2.2" and 1.2" fins, with a base thickness of 0.2". Obviously the one you're suggesting is much larger, but I could buy four of the other heatsinks for the price of two of the larger ones. In case you want to look up the extrusion I used, it's MM11645 located here:

http://www.mmmetals.com/pages/extrus...n_4_and_up.htm

You'll need to scroll down just a little bit to find it. The thermal resistance they list (0.8C/W) is for a 3" length.
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Old 25th April 2005, 06:23 PM   #5
BrianGT is offline BrianGT  United States
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Here is an amp that uses the 200mm version:
http://www.passdiy.com/gallery/alephx-p3.htm

Ignoring the piles of large heatsinks in my basement, I would be interested if the price dropped. I am sure that if you checked different vendors, you could a similar extrusion for cheaper.

I also like the MM heatsinks that Rob (maxhawk) used, and they have been used in by others for Aleph 2 amps:
http://www.passdiy.com/gallery/aleph2-p1.htm
http://www.passdiy.com/gallery/aleph2-p2.htm

Rob's chassis:
http://maxhawk.flagshiphosting.com/p...each/index.htm
or
http://www.briangt.com/gallery/leachamp-5channel

Chassis I helped another friend make:
http://www.briangt.com/gallery/jeetamp

MMM might also have more beefy extrusions if you give them a call.

--
Brian
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Old 25th April 2005, 06:42 PM   #6
Jean is offline Jean  United States
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IF the price drops , then I am interested in 2-4.
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Old 25th April 2005, 07:59 PM   #7
gengis is offline gengis  United States
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Default Different width

Come to think of:
I would actually prefer the 400mm width one, One piece of heatsink per side (12" is little short for the chasis).
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Old 25th April 2005, 09:24 PM   #8
Kari is offline Kari  Sweden
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I'm currently using the 300mm lenght sink for my Mini-A. I'm running the fets at 2.4A/pc. The sinks settles at 65 degree C. I really think that you need more area to be able to dissipate for a 100W AX.

My 2 cents,

Kari
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Old 25th April 2005, 11:06 PM   #9
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IS it difficult to cut these into smaller lenghts, ie. reduce the 8" length to 3.5 to 4"? Can a table saw do this?
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Old 25th April 2005, 11:23 PM   #10
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by kestrel200
IS it difficult to cut these into smaller lenghts, ie. reduce the 8" length to 3.5 to 4"? Can a table saw do this?
I cut some 5" x 2" heatsinks on my tablesaw once without issues. It helps to have a sliding table and a non-ferrous blade. That is my current setup. If you are just cutting them in half lengthwise, the original finished side can stay on top, without much loss in appearance if you don't look at the bottom of the amp.

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Brian
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