Hi,
John wrote:

I have seen several posts in rec.antiques.radio+phono over the years
from people who have rewound the GE "transformers", although I don't
remember who they were from.

I made some functional equivalents, using modern Arnold tape-wound
cores. Photos, and probably some explanation, were posted on the
Forum at antiqueradios.com, but I can't easily locate them now. It
was several years ago. I still have some of the cores, if I can find
them.

Alan