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Old 11th April 2013, 02:50 PM   #11
AUSTINP is offline AUSTINP  United States
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Default Heatsink Source

We use a lot of heatsinks from this company for an industrial application. Not sure of their suitability for amplifiers but their prices are very good.

http://www.tuckereng.com/
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Last edited by AUSTINP; 11th April 2013 at 02:55 PM.
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Old 11th April 2013, 03:25 PM   #12
PMI is offline PMI  United States
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Originally Posted by ezavalla View Post
They seem to be rather small heatsinks for a class-A amplifier...
The thermal spec of the heatsinks sold on Parts Express is unbelievably optimistic (unless they use the moving air figure and omit to say so). That would be sad...

The HeatSinkUSA 10-inch heatsink is three times the size for the same price... no cool black with rounded corners, of course...
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Old 11th April 2013, 03:34 PM   #13
tinitus is offline tinitus  Europe
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Originally Posted by Stefanoo View Post
I think this has been answered other times but I was unable to find the post I saw long long time ago.
wow, and you are from Italy, and ask where ...

fun aside
ModuShop.it have heatsinks as spareparts
300x40x210, 34EUR, +vat
I think they are top quality Fischer from Germany

Fisher have more efficient heatsinks, but would also be more expencive
one with 80mm long fins(i think its SK157...)
or else look at the types with pressed-in fins for even higher effciency

or if its a very big amp with many OPTs, they also have a 400mm wide heatsink
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Old 11th April 2013, 04:47 PM   #14
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Originally Posted by WithTarragon View Post
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.
I should have been more precise. The backs of the ones I received were slightly concave over the width of the profiles. When laid on a flat surface the center was about 2.5mm in the air. This is on a profile width of about 250mm.
This did not affect performance in my application (using Sil-pad isolators) and is maybe normal for 'raw' extruded profiles. Proper finishing would include milling and some kind of painting/anodizing.

I have also used the Modushop heatsinks. These are much nicer and can be ordered without the standard tapped mounting holes. But these are much more expensive, even before shipping to north America. Sizes and profiles types are also very limited.

The HeatsinkUSA sinks are great, unless you need precise mechanical alignment with the enclosure cover or intermediate heat-sink blocks. They also require some sanding on the edges and corners to remove cutting marks.

Last edited by discrete; 11th April 2013 at 04:50 PM.
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Old 11th April 2013, 09:31 PM   #15
PMI is offline PMI  United States
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Originally Posted by discrete View Post
...When laid on a flat surface the center was about 2.5mm in the air. This is on a profile width of about 250mm. ...
That is not very good! In hindsight, I guess I am glad I did not see this b/f I ordered! (mine came in perfectly flat)
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Old 11th April 2013, 09:37 PM   #16
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Quote:
Originally Posted by tinitus View Post
wow, and you are from Italy, and ask where ...

fun aside
ModuShop.it have heatsinks as spareparts
300x40x210, 34EUR, +vat
I think they are top quality Fischer from Germany

Fisher have more efficient heatsinks, but would also be more expencive
one with 80mm long fins(i think its SK157...)
or else look at the types with pressed-in fins for even higher effciency

or if its a very big amp with many OPTs, they also have a 400mm wide heatsink
I live in the states now, so it would be rally impractical for me.
However I am in Italy now for family deal until Sunday.
Not sure though I want to load on my suitcase extra 30lbs of material.


I am going to host a nearly 200Wclass a power amp so I need something pretty good.
Space is not a constraint here as I am building the chassis around the heat sink.
However I would like the slabs of material to line up pretty precisely without too much extra work.
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Old 12th April 2013, 08:31 AM   #17
AndrewT is offline AndrewT  Scotland
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Originally Posted by discrete View Post
................................ The backs of the ones I received were slightly concave over the width of the profiles. When laid on a flat surface the center was about 2.5mm in the air. This is on a profile width of about 250mm.
that is bad. How did heatsink USA react when you told them?
Quote:
This did not affect performance in my application (using Sil-pad isolators) and is maybe normal for 'raw' extruded profiles. Proper finishing would include milling and some kind of painting/anodizing.
You should not have to mill them. Mechanically they should line up with the other chassis components.

Thermally, the curve has almost no effect.
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Last edited by AndrewT; 12th April 2013 at 08:36 AM.
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Old 12th April 2013, 10:36 AM   #18
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Any distributor in the us for Fischer where small quantities can be purchased?
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Old 12th April 2013, 10:43 AM   #19
Johno is offline Johno  Australia
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Try Conrads at Conrad Heatsinks

They are Australian but ship world wide, I think they have an outlet or two in the US, they are well engineered, very large range, good spec sheets and they are die cast, machined and linished. Most importantly the fins are vertical for efficient convection.
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Old 12th April 2013, 10:49 AM   #20
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Originally Posted by Johno View Post
Try Conrads at Conrad Heatsinks

They are Australian but ship world wide, I think they have an outlet or two in the US, they are well engineered, very large range, good spec sheets and they are die cast, machined and linished. Most importantly the fins are vertical for efficient convection.
Yeah but shipping to the us will be extremely expensive!!

I a looking fora distributor that stocks Fischer sk538 or sk539.
Length is 600-650mm respectively and fins are vertical as well with excellent thermal resistance.
I need two blocks of this per side per mono block to handle the amount of class A I am going to burn in.

Ay hint where I can buy these parts?

I will also check with the link you posted but I bet that 15-20lbs of material from Australia will cost a ton off money and might make it not worth it.
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