Hi,
Dave asked:

Would it be possible, though not necessarily practical, to make a reciever
for the modern FM broadcast band, using only pre-WWII tube technology?

The Hallicrafters S-37 tunes 130 to 210 MHz and although it dates
from 1945, it uses 954 acorn tubes and could have been made with 1930s
technology. There's a front-panel selector for AM or FM (narrowband
most likely, but the manual doesn't say and I've never tried running
mine).

73, Alan