[Bleeding Transistor]

Hello Headfi., my first post here. I recently purchased the Stax SRM-1/MK2. It has both the normal and the pro connectors. I am confused about its voltage selection. The back of the unit says that it supports 100v, 117v, 220v and 240v. Also on the back there was a plate that I unscrewed which only had multiple holes with the voltages written but no switch. I wanted to know if the unit auto-switches the voltage or do I need to change it via jumpers or soldering. I live in USA so I need the voltage to be set to 117v. Pics attached

P.S. I don't want to blow the amp

 

[padam]

You only need to put back the plate in the correct orientation where arrow will be pointing at the correct voltage (117V) and it should work.
https://cdn.shopify.com/s/files/1/0024/2352/1341/products/2.-Stax-SRM-1-MK-2-Driver-Unit-Rear.jpg

 

[yaluen]

Plate being referred to is probably those black acrylic ones covering the jumper blocks on units wired for one input voltage. If so, you may need to rewire, see here: https://www.head-fi.org/threads/the-stax-thread-new.223263/post-3902577

 

[Bleeding Transistor]

You only need to put back the plate in the correct orientation where arrow will be pointing at the correct voltage (117V) and it should work.
https://cdn.shopify.com/s/files/1/0024/2352/1341/products/2.-Stax-SRM-1-MK-2-Driver-Unit-Rear.jpg

Mine is a Series B amp. It does not have the arrow at the back plate like this one.

 

[Bleeding Transistor]

Plate being referred to is probably those black acrylic ones covering the jumper blocks on units wired for one input voltage. If so, you may need to rewire, see here: https://www.head-fi.org/threads/the-stax-thread-new.223263/post-3902577

Yup it's the acrylic one. Is there any way to check which voltage the amp is currently running at? Because I would much rather use a transformer than rewiring.

 

[yaluen]

You can remove the four corner screws on the back panel and pull it out a bit to get a better view of the jumper block. Taking off both top and bottom covers first should make that easier to do. Compare what you see with the configs listed in the post I linked should tell you what you need.