[Elecraft] KPA-500: 120vac vs. 240vac

[Ron D'Eau Claire]

Taps on the power transformer ensure the amplifier sees exactly the same
voltage to the RF power amplifier module, no matter which mains voltage is
used, as long as you select the tap as described in the Owner's manual. So
there is absolutely no difference in the voltage, drive or temperature. 

As Don noted, the only difference is the current demand on the mains supply
which, of course, is twice at 120 V compared to 240V. But a standard
American home 120V circuit will handle the load. I run my K3/P3 and a few
other items including a couple of lamps from the same 20A 120V circuit as
the KPA500 with no problem.

73, 

Ron AC7AC

-----Original Message-----
Hi Guys,
 
Wondering if anyone has tested their KPA-500 on both 120v. and  240v. and 
documented the following:
 
1) When operating on 240v. was the PA voltage under  load the same, higher, 
or lower than when operating at 120v.?
 
2) When operating on 240v. was the same, less, or more drive  required for 
the same power output?
 
3) Did the KPA-500 PA temperature  while contesting stay the same, 
decrease, or increase?  
 
Thanks!
 
Dick- K9OM