[Elecraft] KXPA100 Power Out Issue

[k7sss at aol.com]

Hi,The Operators manual rev A7, says a minimum of 13.8 v to get !00 W output. There have been several posts in the past that if the dc is less than 13.8 results in less than 100 w output from the KXPA100. 73Jim HK7SSS In a message dated 9/7/2020 11:38:19 AM Pacific Standard Time, n7tb at comcast.net writes: 
I have noticed over the past weeks that my KXPA100 will not put out any morethan 70-80 watts when I am running my KX3 showing 100 watts output.  Theattenuator is not on.  I have two antennas.  One is a 3 element yagi that isbelow 1.2:1 on all bands without the tuner, so when I tune, it just tweaksit.  Still only 80 W out.  My other antenna is a MyAntennas 10-80 EFHW, alsoresonant below 1.5:1 on 80 and 40, the primary bands I operate on.  I get 70watts out on that antenna.  Everything is grounded properly.  This is afairly recent issue. I have tried the amp with my KX2 as well, to make sure it is an amp problemand not a radio problem, and I get the same result of reduced power output. Any thoughts? Thanks, Terry N7TB______________________________________________________________