For a 500W amp, probably doesn't matter, however, why not plan for the future? Some day, you may want a bigger amp that will require 240V, so put it in now. Barry W2UP -- View this message in context: http://elecraft.365791.n2.nabble.com/120V-vs-240V-tp5964845p5964920.html Sent from the Elecraft mailing list archive at Nabble.com.