Folks:

I don't know if you have been perusing through the 'bay, but Conrad Warren, W7WLM, produces NEW 5 pin coils for your BA transmitters. These are the replacements for the B&W/Bud/ etc coils you have seen come down through the ages.  I recently purchased a 30 meter version.  I suspect he can eliminate the secondary section for us types who use the Ameco type AC-1 transmitters.  Here's a copy of the auction that I used to buy.

 

 

He can also do 4 pin versions as well. 73 de Cal, N6KYR/4