Thank you very much all.? Gary, your explanation and references, particularly Kikkert were particularly helpful.? I am begining to see how mutual inductance works in the transformers. I definitely do not understand it all yet but there is plenty to go on,? And Sarma and Mike - I think you just saved me a lot of head scratching when I start building? (Xtal filter in my case) so also many thanks.?
all the best
Jim
