What happened to toroid power transformers?

[Joerg]

Joerg wrote:




Only easier with the correct machinery.

The formers are made in 2 pieces that clip together and the winding machine spins
the bobbins on the limbs of the core. The bobbins have 'gear teeth' to engage with
the winding machine.

Ah, thanks. To be honest I have never seen one. But it sure looks like a
cool trick.