[Elecraft] KPA500 on 240 VAC in the USA?

[Ron D'Eau Claire]

Oh, yes, several of the field testers ran it on 240VAC and, of course, many
European customers are running with 240VAC. 

There are at least two different connectors used for 240VAC mains in the
USA, depending upon the current the outlet is rated for. 

>From my experience, I definitely would not go to the cost of installing 240V
in the shack just for the KPA500.  

I probably have a worst-case situation here for operating from 120 VAC. My
"shack" has a 15 amp outlet over 60 feet from the breaker panel. That's 60
feet of #14 copper wire, IIRC (1970's construction). Lights, the K3, and
other accessories are on the outlet along with the KPA500 (Of course the K3
draws much reduced current when driving the KPA500). I see a 10 volt droop
at 500W on the band where the KPA500 draws the highest current (6 meters).
The selectable tap arrangement on the power transformer* provides the range
I need to maintain the supply voltage for full output and lowest distortion
even with that much mains droop. 

Ron AC7AC

* Described under "Installation" in the KPA500 Owner's manual

-----Original Message-----
Anybody using 240 VAC in the US? So it uses the same connector on the amp,
but you have to fit a different plug to mate with your 240VAC/20A wall
socket? Looks like this -! ...only without the dot.
Or better still, any droop using the 120VAC option? About 10 amps I guess.
Chuck, KE9UW