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I will dig the manuals out for the Model 75 and see if I can make a simple explanation - there is a modified bias spring assembly for the receive electromagnet that needs to be solved.

Double current isn't that difficult - it is RS232 at higher voltage

The big challenge for the machine on Double Current is the lack of FSG - rare in England, so probably unobtainable in Germany. Anyway, I will see what I can find for you.

Regards
Sean

I found the Single/Double Current convertion on page 70 of the maintenance manual. There is also a reference to a picture.
But I would be very happy if someone with more experience would take a look at it and help with the change.

As soon as I hear back from Roland about the connectors and the connectors are here, we could perhaps arrange a Saturday when I can sit in front of the machine in the museum and take some photos of the current settings.

If you (or perhaps someone else) could figure out how to connect the machine to a single current FSG in the meantime, that would be very helpful.

After some delay the connectors are posted.

I think we need to see if the machine is set for Single Current - the manual gived a good drawing showing Bias Springs.

I will drag my machine out from storage, and see if I can also convert it to SC operation.