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Try Reinhöfer. They do custom stuff. I had some three chamber M42 bobbins which I wanted to use as plate chokes. They wound them for me with some pretty thin wire and a lot of turns. The same as V76 chokes. Pretty cheap too.As the filter inductor don’t need to be gapped you can use high permeability cores with fewer windings. So it should be a pretty easy job for them.
Try Reinhöfer. They do custom stuff. I had some three chamber M42 bobbins which I wanted to use as plate chokes. They wound them for me with some pretty thin wire and a lot of turns. The same as V76 chokes. Pretty cheap too.
As the filter inductor don’t need to be gapped you can use high permeability cores with fewer windings. So it should be a pretty easy job for them.