[AMRadio] Auto transformer to reduce line volts

[CL in NC]

I know some folks use and auto xfmr to lower their line to the older gear.  Do you split the difference between what
the transformer gives when in receive and what it loads down to while transmitting?  My only auto transformer I use on the 
bench, but in my catch all loft, I found an 1800 watt Luxtrol incandescent lamp controller that will also do up to  50 40 watt florescent lamps too.
At first I thought it was a big rheostat, but is actually an auto transformer.  It does say 1800 watts of  regular bulbs, but since it 
also handles florescents, how do you think it would work feeding ham gear, if at all?

Charlie, W4MEC in NC