[VIrak]

I've been running my 100v SRM-1/Mk2 with an adapter, but I'd like to convert it to 240v.

240v:
Blue+White wire from the AC plug
Purple+Gray

So I just move jumper A from the brown cable to the the blue, jumper B from the transformer cable to the purple one, and I'm done?

 

[Tinkerer]

The other side of that (outside of the case) should be a plug that says the voltage (100V). Pull it out (pulls out toward you), then match up the indicator to the desired voltage (240V) and plug back in. Shouldn't be any wire swapping required. This is old days simple conversion STAX.

EDIT, also reconnect your ground wire to the chassis. I see it floating loose there on the right.

 

[VIrak]

This one came without the plug (Japanese domestic version), so unfortunately the wire swapping is required.

Don't worry about the ground wire, it's just loosened so I could tilt the panel for a clearer pic

 

[Tinkerer]

Only people that could help with just the pure colors are probably KG or Spritzer. I'd just ohm out the windings. The primaries I had to deal with on a similar STAX amp looked like this

120 100 G 120 100 G CG

|___|___| |____|__|__|

 

[kevin gilmore]

grey goes to white which goes thru internal fuse to yellow which goes to neutral
purple goes to blue which goes to 120v via power switch
green and brown are not hooked up

yellow goes to white which is 0
green is 100v
purple is 120v

grey goes to 0
brown is 100v
blue is 120v

so swap brown with blue and green with purple

 

[ludoo]

Dropping this here for posterity and so I can find it in the future. This is how my normal bias SRM-1 with external voltage selector is wired. It's not obvious in the picture, but plug has 5 columns, there's a column with no pins between the leftmost one and the bridged pair.