Hi All,
Yes, the F1-X does have internal jumpers that need relocating in order to switch the operating voltage. The last time I opened mine I am not quite sure I saw any markings on the jumpers, so you may need some guidance from the Alembic people. Although, if that is not forthcoming, it should not be too difficult to figure out how to do it. But don't forget mains voltage is dangerous (especially in Europe and under here in Australia), so make sure you know what you are doing.
SF-2 is no problem. It does not have an internal power supply. It needs 10.5 to 19.5 volts DC. Go and buy a local adapter for say 12 VDC, and you'll be fine. From the factory the SF-2 comes with a 15 VDC adapter, but that is not always easy to get. A 12 VDC adapter should work just fine. The one thing I have noticed though, is that the DC socket on the back of the SF-2 is a somewhat unusual size (at least here in Australia), but many of these adapters come with multiple connectors, and one of those should be suitable. A current rating of 200 mA (milli Amperes) or more is fine.
The DS-5R has a voltage switch on the back, so once again no problem.
As far as the FB-2 is concerned, I am afraid I have never seen one, but there is no reason why it should differ from the FX-1 in this regard.
Regards,
Peter Jonas