Anthony,
You can reuse the KPA100 thermal pads unless they are obviously torn in
such a way that they will not go back in place. They usually stick to
either the transistor or the heat sink - take care not to damage or
disturb their relative positions when working on the KPA100 board and
all will be well.
If you do replace the thermal pads, I would recommend that you follow
the re-tightening procedure after about 20 hours of operation at high
power - the new pads need time and heat to conform the the transistors
and the heat sink. If you re-use the old ones, you will not have to do
the re-tightening.
Heat sink compound is not only messy, but for some compounds, the heat
sink pads supplied by Elecraft conduct heat much better. Use heat sink
compound only at your own peril (replacement transistors are about $68 <G>).
73,
Don W3FPR
Anthony Bowyer wrote:
I need to replace the speaker in a k2/100, but it
requires that the KPA100 PA transistors and the board
be removed from the heatsink.
Anyone aware of any issues with reusing the thermal
pads?
I really like thermal grease better, but since this
is what it was built with, I'll stick with it. Just
not sure if their effectiveness is dimished when
reused.
Thank you,
Anthony, NT4X
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