Folks - Please do not replace the thermal pads with heatsink compound on
the KPA100. As designed, the material on the pads flows slightly as they
are heated up during transmit for the first several times, filling in
the small gaps between the transistors and the heatsink surface. That is
why we note that your should tighten the screws after your first several
hours transmitting. Once the initial flow has occurred and you have
tightened the screws there should be no need to tighten them
significantly in the future.
73, Eric WA6HHQ
Elecraft
Dave & Jeanne Robertson wrote:
Thanks for your reply Geoff.
I think that the reason the screws loosen isn't because of twisting
out, but because the heat sink material that is placed between the
power transistors and the heat sink is cold flowing.
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