[Elecraft] 120 vs 240

[Paul Christensen]

> We do this all the time with portable heaters, window
> AC units (about 8 amps) etc.

The quality of the 120V run makes a big difference.  For example, if it's a 
15A branch circuit feeding multiple outlets across several rooms -- and if 
wiring is formed with pressure-contact receptacles, -- and the receptacle 
you need is on the end of the string, don't count on a stiff supply.

By contrast, if a dedicated 20A branch circuit is run only to the shack, 
uses clamp terminals, and the feed is shared between the amp and a few 
low-current devices, then output power should be more predictable with 
minimal voltage sag at the 500W level.

Anyone considering a new 120V circuit to the shack to avoid these problems 
(in my case it was dimming lights) may want to consider pulling a companion 
4-wire 240V circuit to handle all commercial amps, new and old.

Paul, W9AC