[joebog1]

Thanks David,

Yes I agree with what you have said, and I do know the difference between ferrite and iron cores. When it comes to Denco ( I have never seen them in the flesh ) and many others ( Aegis in Australia for instance that I have seen and used ) The winding tension of the wire used, mostly Litz, but some higher frequency coils are plain enamelled wire, some times SCC, sometimes DCC, sometimes SC sometimes DSS, each pertaining to Q, inductance and repeatability in manufacture. Among other things. Like pure silver wire in the finest coils that I have used/seen. The coil data I put up is for a plugin coil type to be used mostly with TRF radio receivers. These coils are wound on old valve bases or coil formers that were designed specifically for purpose, BUT, not that different to an old valve base. The data is from 1949 when radio was "the king ", especially for people like us that cut our teeth on old radio like that.

With respect, Joe.