[Elecraft] KPA500 Clicks

[zendoc at netspace.net.au]

FWIW, I've noticed these clicks from within my KPA500 too.  I always
assumed they were thermal expansion and contraction of hardware within
the amp.  I ignore them because they have
never been associated with any problem with the function of the amp. 
Besides,  I don't know how you'd begin to try to isolate exactly
which bit of metal in there is doing the clicking to be able to do
anything about it.

73,
John
VK7JB