Another big question on my mind was if the K155ID1 Nixie Driver IC would be able to operate at the Raspberry Pi's relatively low 3.3 volts. I did a bit of hunting around the tinterwebs, and through all the speculation and suggestion of all manner of circuits, I came across a blog by a guy that took the plunge [Silviu G. Vulcan] and risked popping a Pi. The result? It works! Well...it did for him, and I suspect the success could vary a little from chip to chip.

I even found, in a spec sheet, that the minimum logic 'on' state could be as low as 2 volts, but I did wonder if that also meant the Vcc for the chip could also go that low. Note that the K155ID1 is a clone of the SN74141, and the datasheet linked above is for the SN74141. The characteristics should be pretty well matched I hope.