Ah, thanks for that article, it might come in handy :)

I thought about doing it this way, but was rather planning to do it slightly differently, by building the right modulator (at, what was it? 2600 bauds? it should be pretty doable to bit-bang using an arduino, or the RPI's GPIO. Maybe even with a digital output, though I'm thinking of using a DAC. Or hell, if using a raspberrypi, why not the audio or video output?

Another option is to bypass the motherboard and use the CRT + keyboard. A friend of mine plans to do just that, and I saw someone post this link on your blog: http://www.cfp-radio.com/realisations/rea48/minitel-01.html

Well, that's for the plans... It's pretty unlikely I'll start this project before 6 months, as I have a lot on my plate :/

Can I use a 230V minitel on a 220V plug in Spain?

We use 50hz too.

Don't see why not, most European equipment is built to handle a range of 220-240V at least, whatever the marking says. At worst the screen might display slightly smaller than intended.

I'm afraid of signal drops.

In 80s, the french electricity network was mostly in 220v. There is no perceptible difference between 220 and 230.

Yes, this will work with 99% proba