[Elecraft] KPA-500 on 120 V

[Joel Hallas]

Yes, the KPA500 can be set up to run efficiently on 120 V vs 240. 

OTOH, as many have correctly noted, it will work much better with a
dedicated 20 A circuit using #12 AWG wire. Recognizing that, I figured it
was not much more trouble to put in a 240 V 20 A circuit with #12 wire (ok,
4 instead of 3 wires, per current code). If you have the space in your CB
box for the proper dual breaker, the effort is almost the same -- but you
get two benefits:

1. The voltage drop, and perhaps more importantly the change in voltage drop
from key up to key down, is about half -- much better for everybody, and
more peak output, if you're counting.

2. You now have the wiring in place for the KPA-1500, should you be so
inclined some day. 

Regards, Joel Hallas, W1ZR
Westport, CT