[Arran]

I would not worry about the values of the filter caps, the originals were all paper and of low values compared to electrolytics, the difference in output voltage will be negligible, if there is any difference. I'm not sure about the 55 and 55F chassis but it may also have a choke input off the rectifier tube rather then a cap, if this is the case then the size of the input cap would never be an issue. Also most of these early radios used a series of filter chokes to filter the ripple out rather then relying on the capacitors, since large paper caps were bulky and expensive. After wet electrolytics came out the capacity of filter caps went from 1.5 to 2 uf to 8 uf to 12 uf, so the cost of large value capacitors went down, and so they could reduce the size and number of filter chokes they used, usually reduced down the field coil in the speaker.
Regards
Arran