"Ian Iveson"
Pooh said:

...toroids which *must* be quite labour intensive

Why?



** More steps are involved in winding a toroidal - plus their manufacture
uses a special "shuttle" winding machine that can do only one tranny at a
time.

R-cores have so many practical advantages it is a surprise how few you see
being used.

Maybe that is about to change.

My recently acquired ( Asian made) CRO has one for example.

http://www.filespoint.com/point/2689...00578.JPG.html




........ Phil