[Elecraft] K3 strange power surging behavior

[NZ0T]

My K3 SN 1502 with MCU 4.83 is exhibiting a strange surge in transmit power
level.   When the rig is keyed in CW with the power set all the way up power
output surges from a high of around 140 (!) watts down to 60 watts and back
in a rapid fashion.  It is at it's worst on 30 meters shows at least a high
power spike on all bands except 160 and 80 before it settles down to around
100 watts.  If I turn the power down the cycling is much less severe but
there is still a leading spike of around 140 watts.  I have tried reloading
the firmware with no luck.  I have checked all my jumpers and connections
and they are fine and the rig does this even straight into a dummy load.  My
power supply is an Astron RS-35M in great shape.

I should mention that we suffered a lightning strike last Labor Day weekend
that took out my Ten Tec tuner, W2 wattmeter and a few other things but the
K3 was not affected at all and I hope this problem is not some delayed thing
from that strike!

An ideas?  The rig is almost six years old - maybe I need to open it up and
make sure screws are all tight?

73 Bill NZ0T



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