[Link500]

i was curious about VA too and i found this formula
100 volts times 5 amps = 500 Volt-Amps, 500 VA.
which looks exactly like how you would calculate watts
p = V * I
where p = watts, I = amps, V = obviously volts.
so it looks like VA is another way to say watts.

and thanks for the VIS isolation transformer suggestion that would be a safer bet. i seen one just like it but the paint is in rougher shape on ebay.
im thinking of getting separate units an isolation transformer and the variac. i have other uses for just the isolation transformer half that i dont need the variac part for.
not sure what to do though. i should be able to plug a variac into a isolation transformer and it work safely making sure to pair the two with the same VA rating. its a little more costly though.