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Old 14th February 2004, 10:38 PM   #1
diyAudio Member
Join Date: Jan 2004
Location: Hudiksvall
Default Heatsinks for Aleph 5

Im thinking of buildning an Aleph 5 in a couple of months.

And I was thinking of buying 2 heatsinks from Conrad Heatsinks.

Would one MF35-151.5 be enough for one channel? (0.21 C/W)

I have seen 2 calculations: (this for 150W/channel and 23C amb.temp.)

C/W x W + amb.temp. = 0.21 x 150W + 23 = 54.5C

Or some formula at Conrad, with some correction factor K: (calculated for 30C rise above ambient, K=1.33)

30/(1.33 x 0.21) = 107.4 W power dissipation.

for 150W there would be:

40/(1.24 x 0.21) = 153.6 W power dissipation.

In this case the heatsink temp. would be 40 + 23 = 63C

Someone know wich one of these is the most likely?

And the transistors would be spread out over the heatsink...

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Old 15th February 2004, 12:22 AM   #2
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Join Date: Feb 2002
Location: Canada
Have a look at Mark Finnis' Aleph 5. He uses similar heatsinks and hopefully his experiences will be a good guide for you.

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Old 15th February 2004, 04:08 AM   #3
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Join Date: Jan 2004
Location: Hudiksvall
Oh thanks that helped!

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