[Elecraft] KX1 power supply

[edward kacura]

I've been running my KX1 from home with the nomal 13.8 v and get right at 3 watts out. When I put 14.9 v (max output from the pwr supply), I'll get 4.1 watts out of the KX1. 
 
A 1 watt increase, not a lot of difference I know, but every little bit helps. Here's the question, does it, or will it hurt the KX1 in the long run, running 14.9 volts into the radio, I know the manual says 14 v. Does that .9 v make any difference to the PA, or should I just stick to my 13.8 v and 3 watts ??
 
I love the little radio, even thou I have the KX3,  and don't want to hurt it ! It's just so simple and easy to operate, and FUN !! (I'll never get rid of it !!)
 
Thanks......
 
72/73 de Ed N7EDK