Minor scratches are OK. This material melts and fills the gaps between
the PA transistors and the heatsink as the devices heat up the first
couple of times. (That is one of the reasons we require tightening of
the transistor mounting screws after a initial short period of use.)
73, Eric WA6HHQ
Elecraft
-----------
Harvey Howell wrote:
While working on the amp I noticed that the black coatings on the
thermal pads seem to scratch easily. Mine have a couple of minor
scratches that go thru the black. Does this reduce their ability to
conduct heat away? Should I replace them? Thanks.
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