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Old 7th March 2013, 07:14 PM   #1511
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Does them being black anodized really make a difference, I was looking these. I can get them cut to length.

7.280" - HeatsinkUSA, LLC Store

Unless there is something better then that, for aftermarket.
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Old 7th March 2013, 07:19 PM   #1512
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If you haven't seen it yet. Nice article: Heat sink - Wikipedia, the free encyclopedia
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Old 7th March 2013, 09:10 PM   #1513
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Another thing, I just have no ideas how sinks for the store (or hifi2000.it) have such good dissipation numbers. From my humble knowledge ones from heatsinkUSA should be much more efficient, but they not...
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Old 7th March 2013, 11:24 PM   #1514
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Quote:
Originally Posted by PKI View Post
Another thing, I just have no ideas how sinks for the store (or hifi2000.it) have such good dissipation numbers. From my humble knowledge ones from heatsinkUSA should be much more efficient, but they not...
I wonder if that has to do with the density or thickness of the fins.
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Old 7th March 2013, 11:26 PM   #1515
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They are black anodized, the HeatsinkUSA are raw. That will make a difference.

Of course, you can anodize the HeatsinkUSA 'sinks and make up said difference.
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Old 8th March 2013, 12:00 AM   #1516
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Quote:
Originally Posted by 6L6 View Post
They are black anodized, the HeatsinkUSA are raw. That will make a difference.

Of course, you can anodize the HeatsinkUSA 'sinks and make up said difference.
I'm not that impatient.
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Old 8th March 2013, 08:16 AM   #1517
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I posted a link in the Solid State heading but as the F5T makes use of a MOSFET output stage I thought I'd ask the question here too. Can anyone please give me an answer on what the difference is between placing the series resistor between the mosfet Drain and supply vs placing the resistor between Source and the load.

On my simulation the series R between Supply rail and mosfet Drain gives the lowest harmonic distortion figure, why?

Here is the original post with schematics of the final stage

Rd or Rs on MOSFET output
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Old 8th March 2013, 08:18 AM   #1518
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Reduced degneration. More gain for feedback. Dont trust the sims too much, from what i have heard.
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Old 8th March 2013, 12:13 PM   #1519
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Another thing, I just have no ideas how sinks for the store (or hifi2000.it) have such good dissipation numbers. From my humble knowledge ones from heatsinkUSA should be much more efficient, but they not...
the C/W ratings depends on temp. if they measure C/W ratings at 80C above ambient, the numbers will look much greater then if they measure at 25C above ambient. there you have the difference.
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Old 8th March 2013, 06:52 PM   #1520
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Originally Posted by 6L6 View Post
They are black anodized, the HeatsinkUSA are raw. That will make a difference.

Of course, you can anodize the HeatsinkUSA 'sinks and make up said difference.
At given temperatures radiational contribution in heat "transport" will be much smaller compare to convectional contribution. So I would speculate that AudioSan right -- it is more how you measure it.
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