Volker Tonn wrote:

Jon Noring schrieb:

In the last couple of years I've posted various inquiries to this and
related newsgroups regarding high-performance, tube-based AM (MW/BCB)
tuners, both "classic" and modern.

Have a look into the "Collins" S-series. These are state-of-the-art
tube sets 'til now. At least it's not the tubes alone but the fabulous
mechanical IF-filters giving outstanding results for a tube set.
Manuals with layout diagrams should be available on the web....

The mechanical filters are only good for reducing the BW of an existing IF
strip to make the receiver extremenly selective,
so a much reduced bandwidth is possible which isn't capable of wide AF BW.
Crystal filters are also used for the same purpose.


Since Mr Noring says he has regularly trawled the Net for everyone else's
expertise
on AM reception, but got nowhere, because he's still doin it,
why doesn't he gird his loins and put his shoulder to the task of learning
all about AM and radio engineering as spelled out so clearly in all the old
text books, and then
damn well build his own perfect AM radio???

Patrick Turner.