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Old 10th February 2011, 04:36 PM   #1
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Default Heatsinks class A amp question

Wich heatsinks need an amp in class A with a total heat disipation of 520W with a total bias 11A giving 120W RMS at 8 ohms load?

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Old 10th February 2011, 04:53 PM   #2
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520 watts says it all. You want about 25 deg C rise above
ambient, and that means 25/520 = .047 deg / watt
heat sink rating.

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Old 10th February 2011, 05:03 PM   #3
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Lets not be confused. That was .047! Not .47! 10X the sink capability of .47
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Old 10th February 2011, 05:03 PM   #4
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Thank you Nelson
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Old 10th February 2011, 05:07 PM   #5
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Why have you started another thread on the same subject ??
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Old 10th February 2011, 05:09 PM   #6
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Quote:
Originally Posted by Andy5112405 View Post
Why have you started another thread on the same subject ??
Because I supposed will be better a post in the Pass Labs forum due to the fact it's a NP design.
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Old 10th February 2011, 05:14 PM   #7
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It's ok the schematic? because BobEllis answered me in the Solid State forum:

Heatsinks class A amp question
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Old 10th February 2011, 07:30 PM   #8
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Quote:
Originally Posted by flg View Post
Lets not be confused. That was .047! Not .47! 10X the sink capability of .47
Yeah, and that's per channel. So you need two.
Or build monoblocks.
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Old 10th February 2011, 08:19 PM   #9
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A heatsink, with that capacity? Several words come to mind: cryostat, liquid nitrogen, dewar jar, etc, etc
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Old 10th February 2011, 08:39 PM   #10
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If you are seriously considering building this thing you could do it with 4 x conrad mf35-151.5 per channel. So 8 total, but it will still be quite hot. If you want a cool running amp make it 6 per channel.
And don't think about stacking the heatsinks on top of each other because you lose efficiency.
Probably a cube shape heatsinks on all 4 sides
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