Permeability Tuning

[pwdrive]

My (the) Ekco A28 uses permeability tuning but only for one of its short wave band ranges. The way it's done is quite novel. Per 'Trader' it uses iron dust cores.

Andrew

Thanks Andrew, the brief for my idea is to have (if possible) one type/grade of slug that will cover the shortwave spectrum, the reason being is that I am aiming for my Regenerodyne project to have plug in coil packs, mechanicaly I can do this no problem if only one type/grade of slug is used but if I need different types/grades for different bands then it's going to be a no no.
The plan would be to have one panel mounted RF tuning control operating two ganged slugs within the plug in coils (RF amp grid tuning & Mixer grid tuning)

Lawrence.