Hi Keith,
That looks a very professional job considering the method used! Did you have some form of turns counter rigged up- tell me you didn't count 3000 turns manually
You must feel rather pleased with the result!
There have been various references to standards conversion using a PC in the 'standards conversion' thread. This one in particular
https://www.vintage-radio.net/forum/...d.php?t=130716. There are a couple of youtube videos as well showing the results.
Seems an interesting idea and if I had better computer skills, I would be keen to have a go at it.
All the best
Nick