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If you want a dry load then start off with two of these Large Flat Aluminum Heatsink Heat Sink 11 5" x 4 5" x 1 5" | eBay
bolted to a single piece of copper plate. The copper plate is called a spreader and will transfer heat much better. You MUST use a heatsink compound between the device and the copper plate and between the copper and aluminum plates. Only a very tiny amount is needed. Too much is as bad or worse than not enough.You will need a fan on it as well. If you want to put it in an oil bath then omit the copper plate and use one of the heatsinks. Above all do not push it too hard.

I have been looking at those myself to make a high power load. Getting tired of my present load even though it will handle a couple kilowatts easily but it is oil filled. I want something cleaner.
http://www.ebay.com/itm/large-flat-aluminum-heatsink-heat-sink-11-5-x-4-5-x-1-5-/200950593176?pt=LH_DefaultDomain_0&hash=item2ec996b698

<blockquote data-quote="Captain Kilowatt" data-source="post: 437873" data-attributes="member: 39">If you want a dry load then start off with two of these <a href="http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&amp;toolid=10001&amp;campid=5336136228&amp;icep_item=200950593176" target="_blank">Large Flat Aluminum Heatsink Heat Sink 11 5&quot; x 4 5&quot; x 1 5&quot; | eBay</a>bolted to a single piece of copper plate. The copper plate is called a spreader and will transfer heat much better. You MUST use a heatsink compound between the device and the copper plate and between the copper and aluminum plates. Only a very tiny amount is needed. Too much is as bad or worse than not enough.You will need a fan on it as well. If you want to put it in an oil bath then omit the copper plate and use one of the heatsinks. Above all do not push it too hard.I have been looking at those myself to make a high power load. Getting tired of my present load even though it will handle a couple kilowatts easily but it is oil filled. I want something cleaner.<a href="http://www.ebay.com/itm/large-flat-aluminum-heatsink-heat-sink-11-5-x-4-5-x-1-5-/200950593176?pt=LH_DefaultDomain_0&amp;hash=item2ec996b698" target="_blank">http://www.ebay.com/itm/large-flat-aluminum-heatsink-heat-sink-11-5-x-4-5-x-1-5-/200950593176?pt=LH_DefaultDomain_0&amp;hash=item2ec996b698</a></blockquote>

[QUOTE="Captain Kilowatt, post: 437873, member: 39"] If you want a dry load then start off with two of these [url=http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&toolid=10001&campid=5336136228&icep_item=200950593176]Large Flat Aluminum Heatsink Heat Sink 11 5" x 4 5" x 1 5" | eBay[/url] bolted to a single piece of copper plate. The copper plate is called a spreader and will transfer heat much better. You MUST use a heatsink compound between the device and the copper plate and between the copper and aluminum plates. Only a very tiny amount is needed. Too much is as bad or worse than not enough.You will need a fan on it as well. If you want to put it in an oil bath then omit the copper plate and use one of the heatsinks. Above all do not push it too hard. I have been looking at those myself to make a high power load. Getting tired of my present load even though it will handle a couple kilowatts easily but it is oil filled. I want something cleaner. [URL="http://www.ebay.com/itm/large-flat-aluminum-heatsink-heat-sink-11-5-x-4-5-x-1-5-/200950593176?pt=LH_DefaultDomain_0&hash=item2ec996b698"][/URL] [/QUOTE]

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