The ferrite 755C probably wouldn't be too expensive to remanufacture, but it is also nothing special. The 755A is the magic version.

The Alnico 755A used a chunky 3 lb.+ cast donut of alnico...I'd guess the magnets would cost well over $100 in quantity, maybe a lot more than $100 in any reasonable quantity relative to demand. Raw Alnico V is over $30 a pound these days from what I've read recently.

The cone of a 755A is also deceptively complex. Supposedly high silk content fiber mix, variable thickness, with a center compliance....would probably be expensive to tool up to make these too, if appropriate machines still exist.

Reproducing complete 755As and spare 755A cones has been tried in Japan in the past, with disastrous results.

According to my Japanese expert friends from Western Sound Inc., the 755C cone is different in a number of ways from the original run WE 755A cones and sounds nowhere near as good. These guys have worked with 1000s of 755As and repair them all the time. They demonstrated to me how the later cones are softer and less rigid than the original A cones. Put a C cone on an A and it sounds like a C, they say.

The 755A is a speaker that is more than the sum of its visible parts. Yes, there is a lot of hype about it, but much of it is justified...even though the totally crazy prices are hard to swallow. I never heard anything else like a 755A.

They were a lot more fun when they were $5 to $100, instead of $1000 -$3000 each, though!