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Re: [Amps] Arctic Silver

Subject: Re: [Amps] Arctic Silver
From: Steve Thompson <>
Date: Thu, 12 Dec 2013 08:35:33 +0000
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I'll echo other's comments about Arctic Silver, which I've used on numerous high power transistor amps.

Taking for granted that the copper heatspreader and main heatsink are milled truly flat, the crucial thing is to get the transistor flange flat as well. The majority I've handled are not anywhere near flat, and always bowed upwards in the centre (something that hasn't improved since the package style first appeared ~30 years ago). I use the method mentioned by others - fine emery face up on glass. Mirror glass is good, as it tends to be made better and any imperfections in the surface show up.

If the copper spreader is thick enough, the heat is spread over a large enough area whereby the heat sink compound is less significant and the regular white stuff can be used - but even that varies in quality. I stick to Dow Corning or Emerson.

Don't assume your copper spreader is flat just because it was machined so in the workshop. Most of it is rolled and it's quite normal for it to change a bit after the hard outer layer is skimmed off (just like timber).

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