Here's another option I am considering: the speaker I have works OK -- it's just that the cardboard diaphram is deteriorated. I wonder if the existing speaker could be repaired by a speaker repair specialist, by replacing the cardboard diaphram?
I've seen automotive restorers that will re-cone a speaker on vintage cars. I don't have any specific links, but do a search on "speaker reconing" and you'll find lots of services and kits available. Most likely you'll find someone fairly local.
