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Regulator Temperature

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I just finishing up my TSE build. I'm running the 45s with filament current only to see where the temperature stablizes on the Sharp 10M45S regulator. I'm a little paraniod about smoking the little bugger as these are not easy to come by now.

It's setting at about 155 F now after about an hour. A bit too hot to touch comfortably.

The datasheet says: Overheat protection may operate between 125C and 150C. Really, it says may. Haha, that will inspire confidence.

Am I good with the heat sink I have?
 
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