While trawling through some files, doing some ‘house keeping’ on the computer as you do, my eye found this technical update bulletin from Denco coils. I’m sure I even had a picture of the old Denco building somewhere too. When I find that I’ll post it up here too.
In the meantime here is their document which is more of a practical design guide/ application notes for their long discontinued coil range leaving us just the legacy of many radio designs based on these now obsolete components. Take it and re-invent them using a toroidal home wound component. R A Penfold and Babani books would be proud of you.
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