I had one of my K3's develop a similar fault. In my case it was a
failure of Q2 (FDS6375, RF board) which is the power switching FET.
elecraft spares sent me out one and I had it in a few days 

An IRF7416QPBF might be a junkbox replacement if you are very
impatient! 

it's pretty easy to get at

On Tue, 2009-11-10 at 13:05 +0000, Ian Maude wrote:
> Mod done, still the same!  Odd that it should just appear after all this
> time.
> 
> 73 Ian

-- 
73
Brendan EI6IZ 

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