K3 Woes: Radio Shuts Off at Power Levels >20 Watts

[David Inger-2]

My beloved K3 is giving me fits.  It was recently returned from Elecraft
service for some 8v regulator capacitor replacements.  This was done in
April.  I have been operating the K3 on just a few occasions since then.
Last night when attempting to tune up, the radio would shut down if the
power output was set higher than about 20 watts.  At lower power levels the
radio would tune.  SWR on two different antennas was <1.2:1.  The display
also showed significant dimming even at low power tune up attempts.

 

I have done a factory reset per the manual and reset the parameters in the
Config menu.  I have done the reset twice.

 

I have switched out external power supplies (from a Samlex 1223 to a
Powerwerx SS-30DV).  I have fabricated a new power supply cable from the
supply to the radio; still no joy.

 

Before contacting Elecraft service, I would appreciate any suggestions of
something (obvious) I may have overlooked.

 

Tnx es 73 de K6SBA

David in Santa Barbara, CA

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[vk4tux]

What is the K3 screen voltage indicator telling you?

NB:(Apologies to group for some bad spelling in earlier posts. Using nabble at the moment and had edited the posts before, but alas the unedited versions got sent)

Adrian ... vk4tux