I'm in the U.S. and I'm just curious as to why this amp has the option of 110V and 118V ?
My other vintage oranges have 115V and the next available voltage is 200V 220V and 240V, so it's pretty easy to tell to just use the 115v.
I'm assuming use the 110V but I do know 115V is common here. Should I just measure the wall socket and use whatever is closer either 110v or 118v?
Or was 110V & 118V designed for another country?
Also, in the far bottom right in the picture, what does 100V Line mean? is that for the top 1/4 output jack or is that for the ohm selector? Should I only plug a speaker cab into the bottom of the two output jacks?

Thanks