Hi Gord,
There are several places in the states that will rewind transformers, and there was one in Calgary, I had a custom transformer made several years ago by them. I will see if I can find the name and will pass it on to you. I have a list of websites that are pretty usefull for finding this stuff out. Google BOAT ANCHOR RADIOs and you will find a few places that may be able to help out.
Regards,
Clint