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Old 15th February 2011, 01:51 AM   #1
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Default F5 Heat sinks

So i'm preparing to build a stereo F5, and i'm going to need some heat sinks!
While i found some at Heatsinks USA, it seems like an awful lot to ship. While i'm here in the states, i'm hoping to find something within the US, That isn't going to be an arm and a leg to get home, but i need something sufficient to cool this amp. After some reading it definitely seems like it runs hot.

It also might be vital to inform that i'm in hopes of being able to rack mount it.. And after doing reading, i would find a way to do a forced convection, within the rack, to move air across the heat sinks so that it isn't to overheat, while powering the fans by themselves, and not off the power supply of the amp. That being said, i'm in hopes of keeping it 7 inches tall, but if thats not possible i can work around that. And length from front to back i believe is only limited to 20"? and fin height again, should only have a limitation big enough that i shouldnt need it. hopefully only 3" total height from Fin tip to the back of the base, I need to make sure i have room between the 17" between the rack rails to put my transformer and power supply pieces in!

In advance i want to thank anyone that has any information for me
-Cody
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Old 15th February 2011, 02:37 AM   #2
Apex Jr is offline Apex Jr  United States
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I'll chime in here, I still have some of these in stock...

FS: F5 Heatsinks

Steve @ Apex Jr
and I'm in Southern California
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Old 15th February 2011, 02:47 PM   #3
labjr is offline labjr  United States
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Quote:
Originally Posted by crazycody1993 View Post
So i'm preparing to build a stereo F5, and i'm going to need some heat sinks!
While i found some at Heatsinks USA, it seems like an awful lot to ship. While i'm here in the states, i'm hoping to find something within the US, That isn't going to be an arm and a leg to get home, but i need something sufficient to cool this amp. After some reading it definitely seems like it runs hot.

-Cody
I think Heatsink USA is very reasonable. At least they were in October. I paid $113 including shipping for two 12" pieces of the 10" profile which I thought was a super deal. The stuff is heavy. Shipping costs are expensive these days. Good luck finding a better than that.

BTW you're gonna need about 10 inches of the 10" profile heatsink per channel to passively cool the F5.
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Old 15th February 2011, 03:02 PM   #4
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Yeah, I was looking at 7 inches of the 10.08 inch profile, and it was going to be 88 to ship home. And its at least better to know I didn't just hit a dead end. I was also looking at one of the cases par metal has, for 165 they have an all aluminum case with hdatsinks. I think they're only 5.25 tall, but 17 long. Would this be up to standards to work for an F5?
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Old 15th February 2011, 04:41 PM   #5
labjr is offline labjr  United States
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You should read the F5 manual. It says a 6X8 piece of heatsink with 2" fins per output device. That's 96 sq in per channel. Any less will probably risk running too hot. A 5 x 17 shape doesn't seem to be optimal for the F5 since the outputs would have to be too far apart to cool.
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Old 15th February 2011, 05:01 PM   #6
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Does having a thicker base holding the fins help that? So that the heat would disperse to all the fins more equally? And could transfer farther out from the output devices?
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Old 15th February 2011, 05:22 PM   #7
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These thick baseplates are damn heavy.
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Old 15th February 2011, 06:23 PM   #8
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Isn't that kind of part of the minimalist viewpoint though? Whatever is necessary for the job?
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Old 15th February 2011, 07:33 PM   #9
labjr is offline labjr  United States
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I wouldn't say this hobby is minimalist. Though some seem to be minimalist readers.
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Old 15th February 2011, 07:36 PM   #10
tinitus is offline tinitus  Europe
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200 x 300mm each channel will do
or 150 x 400mm
some use a 165 x 300mm (Modushop)

but how hot it gets might depend on your build
your room temperature during summer time
things like how well you ventilate the inside of your amp
and transistor isolating pads, how effective they are
mounting, smoothness of heatsink surface
and, bias is a variable too
also your actual supply voltage
and toss it all together in one pot, and ....
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