[Nathan Slingerland]

I looked back at the original source Philco parts catalogs.

Philco 1933 parts catalog:

   

Philco 1936 parts catalog:

   

All of the later Philco catalogs (1937, 1938, 1942) that we source from also say 400 ohms.

I'd say that 400 ohms the correct value. For the Library Chokes table I've updated it to be that value too.