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Old 15th June 2012, 05:54 PM   #791
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I don't understand the need for Nelson to discuss something that is obvious and nothing to do with the performance of the amp.
That is why I am unsure what he is saying
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Old 18th June 2012, 10:00 PM   #792
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1:Will the BA-3 front end run on +-30v?
2:Can Conrads biggest heatsink take 150w of heat?
Conrad Heatsinks - Products
The MF35-151.5
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Old 20th June 2012, 02:13 AM   #793
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Quote:
Originally Posted by Ryssen View Post
1:Will the BA-3 front end run on +-30v?
2:Can Conrads biggest heatsink take 150w of heat?
Conrad Heatsinks - Products
The MF35-151.5
From experience the most you can push one of those heatsinks is 130W, but I try and keep it below 110W. Just do monoblocks ie 4 heatsinks
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Old 20th June 2012, 02:56 AM   #794
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Old 20th June 2012, 09:51 AM   #795
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Quote:
Originally Posted by Melon Head View Post
From experience the most you can push one of those heatsinks is 130W, but I try and keep it below 110W. Just do monoblocks ie 4 heatsinks
Ok,I guess it is possible to keep the bias down to not reach more than 130w/heatsink.
Will this affect the sound negative?

Is there a heatsink that can take 150w?
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Old 20th June 2012, 11:28 AM   #796
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most heatsink will be capable of dissipating 110W to 150W.
But one must ask " at what temperature?".
If the aluminium is almost at the melting temperature there is not much strength left for the clamping medium !
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Old 20th June 2012, 11:33 AM   #797
Ryssen is offline Ryssen  Sweden
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Quote:
Originally Posted by AndrewT View Post
most heatsink will be capable of dissipating 110W to 150W.
But one must ask " at what temperature?".
If the aluminium is almost at the melting temperature there is not much strength left for the clamping medium !
Ok,I mean "take 150w" and be in the temperature range of 50 maybe 60degres celsius.
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Old 20th June 2012, 11:42 AM   #798
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Old 20th June 2012, 11:55 AM   #799
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delta T s-a of about 30C degrees then?
The Derating Factor (DF) for that will be about 0.5 ref 75Cdegrees.
Rth s-a = Delta T / P * DF = 30 / 150 * 0.5 = 0.1C/W
That is a mighty big heatsink.
BUT,
one must consult the manufacturer's derating table for their specification method.

Each term in the calculation will have a very significant effect on the actual dissipation.
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Last edited by AndrewT; 20th June 2012 at 11:58 AM.
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Old 20th June 2012, 12:10 PM   #800
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Originally Posted by Ryssen View Post
Ok,I mean "take 150w" and be in the temperature range of 50 maybe 60degres celsius.
I have already done extensive testing with these heatsinks. No need to do the calculations.
Any where between 110W and 130W and you will be ok.
Regarding sound quality. If you have at least 10W of class A operation (assuming BA2 output) then the rest is just icing on the cake.
So I would not be too concerned about it for a push pull output stage (source follower).
If it was a single ended output stage (BA1) then I would definitely want more biasing overhead.

Just buy 4 of those heatsinks though, it opens up a whole range of options that you will want to explore sooner or later.

Last edited by Melon Head; 20th June 2012 at 12:20 PM.
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