Trevor Wilson wrote in message
...
N_Cook wrote:
Well I only see it in USA kit. A toroid but flattened into an elipse
shape in plan view and a coil around each straight section. The
curved ends of the ring are exposed. Laminated core construction so
easy coil winding ?

**Like these?

http://www.custommag.com/products/r-core.shtml


--
Trevor Wilson
www.rageaudio.com.au




Yes it would seem R-Core, eg
http://www.dibao-transformer.com/Ima...ansformer-30VA.
png

I wonder how they are made.
Coils formed and laid over the bare cores which are then joined somehow
farely seemlessly and then perhaps 4 sections of quartered pre-moulded epoxy
covers slid over the cores and under the coils and plastic welded into place