I don't recall ever seeing or hearing about the 7193 - cool find. There's not much information, but it seems to be a 6j5 with (slightly) higher dissipation rating and a really odd envelope. So it should work pretty well, the 6J5 and 6SN7 are very linear. You'll need four, which will make a pretty dramatic visual presentation! Should be a nice preamp - I'm still using my FP-III at home, with Eros and Paramounts. You may want to use shielded cable for the grid caps, especially the voltage amp, so they don't pick up RF interference. Post pictures when you get it going? I'd love to see it.
There's a 7-pin miniature version of the 6J5 as well - 12H4 - with 6/12v heater; I only ran across it a few days ago.