STAX input voltage question


This is my very first thread posting, so please be tolerant if I sound stupid (but I really AM! lol). I acquired a STAX SRM-1/MK-2 and before turning it on, I want to make sure that the voltage is set to 117V. There is no jack in the back of the unit where voltage is switched between 100V, 117V, 220V, 240V. And, there is a sticker on the back that says "AC 100V Only". Can I obtain a jack to switch to 117V or am I already there or should I get a new hobby? I will likely have lots of dumb Stax questions but this one is paramount at this point. Thank you in advance for any advice.
ill
There are many different versions of the SRM-1 Mk2 and some have a voltage selector and some do not. It could even be hidden inside but you can never know with Stax. Since it says 100v only on the back then the amp is Japan spec and probably configured for 100v only. Pictures of the inside of the amp will help, especially of the bottom of the main PCB.

If you want to talk more about Stax then I suggest you hop over to www.head-fi.org as there are quite a few of us Stax-o-philes there.
Thanks so much Spritzer for the info and advice. You are my VERY FIRST thread/blog/forum (whatever you call this thing) contact/friend/advisor! I just signed up with head-fi. Yes, I will likely have more questions, as I seem to have been re-bitten by the STAX bug, after it lie dormant for over two decades.
Glad to help or bring you deeper into the headphone madness. I've got it pretty bad with more the 40 electrostatic headphones, some 7 amps and 20+ adapters.

I'll see you in the Stax thread on head-fi