[Elecraft] K3 Power Shutdown

[Hunsdon Cary III]

I've used an Astron RS-35M power supply for about 25 years, that's what I used when I got my K3-100 #3449.  A few weeks ago, the K3 began to shut down in transmit....25 watts seemed to be the magic number...below 25 watts, OK; above 25, dial lights flicker (no error message or High Current warning) and the K3 shuts down.  It will turn back on immediately but the same thing happens.
High SWR?...no, showing 1.1-1....antenna connected?  YES, it does the same thing with my tri-bander, dipole, and dummy load!  Not the antenna or feedline.
Must be the power supply, right?  Well, I ordered a Samlux SEC 1223 which arrived UPS today and that's not the problem....K3 still shuts down!

Have I done anything to the K3....well, as a matter of fact, I used some of my VHSL basketball officiating money to add the Digital Voice Recorder.   No easy feat installing that as the front panel has to come off but, hey, I "built it", I can do it... and did...complete with anti-static mat, etc.  DVR works so I did something right or maybe not....

My Icom 706MkIIG works fine with the SEC 1223 and all the antennas, including dummy load.  Alas, the problem must be inside my K3...Absent error messages, plus nothing in the manual under troubleshooting that covers it, I'd appreciate some help in tracking this problem down and resolving it!

73,
"H", K4TM
LYNCHBURG, VA


H. Cary III
h3cary at gmail.com