[Elecraft] Thermal control for Q1 / Q2 in KPA100?

[Tom Nickisch]

Hi Keith, 
   
  The thermal pads actually conduct more heat away than thermal grease.  The pads used these days are quite impressive.  A couple of years ago an engineer Friend of mine and I had this discussion and he then went out and dug up enough data to have me buried for a week.
   
  Tom W8AMZ
  

"Darwin, Keith" <Keith.Darwin at goodrich.com> wrote:
  As I'm thinking about trying to operate the K2/100 so the fan doesn't
run (or doesn't make noise) I wonder some things.

First, blowing air out of a box cools the box better than blowing air
into it. I'm half surprised the fan blows in. I suppose it is to
direct the stream of air on the finals. Still, I wonder about doing it
differently.

What about thermal grease? There is only a non-grease pad between the
transistors and the heat sink. Would a dab of grease conduct more heat
away from the transistor? I have some fancy "silver" stuff left over
from my computer assembly activities.

What power level should I run if I don't want the fan to come on? 75
Watts? 50, 30, 12?

- Keith N1AS -
- K2 5411.ssb.100 -
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