I dug deep into my treasure-boxes and found two additional RFCs.
http://gordis.mine.nu:3000/bilder/da...s/PB180005.JPG
I measured their inductance and the one without "legs" are 940uH. I think this will be perfect for the oscillator plate RFC. The other one, with legs on it, measured 870uH. I think I can use this for the oscillator screen grid. Unfortunately I had nothing to test for self-resonances, but these should be low capacitance coils.
Hopefully I can try making the 807 plate RFC tomorrow. Maybe I should go for something with even bigger radius, that way I don't have to wind as many turns as I would have to do with a smaller diameter coil form.
/Oskar