The Orton Autofire 3000 Operates at 24V AC input. This info can be quite helpful in figuring out what input voltage you should have.
If you could have someone trace the wiring from the inputs on the controller to the transformer that supplies it, that would help figure out the source voltage. For instance, you're likely looking at a 10:1 transformer, meaning 220 to 240V.
On a sitter related note, the sitter is capable of cone 12. Not sure about your particular kiln though.
We've dealt with quite a bit of older equipment and have overcome the "who made this" problem in the past. Luckily, these things are full of fairly universal parts.