[Arran]

I would save the 199s for another radio, the 201As are a better option in my opinion, since the 1 amp 201s were what was originally used, they are closer in looks, and in filament characteristics to the 201s. I think that if you were not operating the set from a power supply then you could add resistance to raise the current draw, such as paralleling a resistor across each tube filament, this assumes that the RA-DA was not a later production type, nor was modified to accept 201As, it may have been modified to accept 199s for that matter, such as by installing a different rheostat. As Russ mentioned the pinout of a UV 199 is different from a UX 199, I think that the plate and grid pins were swapped to match those of a 201a on the UX.
Regards
Arran