[R-390] Question about VARIAC

[Barry]

I bought a General Radio 200CU VARIAC.  It is designed for 115VAC input and 
produces 0-135VAC.  It is designed with 292 turns with taps on both ends at 
43 turns.  The input circuit is shown to connect to one end and the other at 
the 43 turns tap.

Since the power here runs about 120V, this causes the output to run closer 
to 145VAC instead of 135VAC.  I would like it to swing just the line voltage 
and no more.

Would it be advisable to connect the input across the entire 292 turns 
instead of 249 (292-43)?  I know this would give me no more on the output 
than the intput voltage, but am wondering if this would be harmful to the 
VARIAC.  The little plate on the side doesn't show this as an alternate 
wiring, and I assume the other tap would be used so that the direction of 
the knob can be changed (e.g. CCW would increase the output voltage instead 
of decreasing it).

Thanks guys,
Barry - N4BUQ