The top one is wound on the type core The Chief designer and I used in the original 40/80 receiver. He wound it himself!
The middle one was the next one in the progression. Designer In Training wound it for him. He bragged she had excellent vision. Good hand eye coordination too!
The bottom one I wound today. I used an eye piece and stumbled through it. For reference the wire is #34.
Two a day is about all I want to wind. Anywho time to build some DBM's. Our previous test told us the smaller ones performed better. The new one should be spectacular????