wrote:
Jon Noring wrote:

Well, being the "OP", I want a high-audio performance, modern
design AM tuner to integrate into my audio system -- and I believe
a lot of tube-o-philes likewise want that -- but not everyone
obviously. There are several reasons why most higher-grade audio
systems use separate components, the reasons of which are obvious
to most everyone. The AM tuner is no different than other audio
components in this regard.

Maybe what you want is the old JW Miller passive AM tuner. No
active devices at all, just a bunch of tuned circuits and a detector
diode.

Yes, possibly. John Byrns has written about the J.W. Miller TRF AM
tuner quite a few times, along with other related ones (and the early
30's Western Electric 10A which seems to have inspired the others.)

See, for example:

http://groups.google.com/groups?selm...&output=gplain

(Is there a schematic of this tuner online? John had it at his site at
one time, but apparently has taken it down.)

Hopefully John will have time to comment on his approach to designing
a workable, improved modernized version of this class of tuners,
suitable for diytube-like kit-building, with working PCB boards. I
know the TRF design is capable of very clean audio, and this is one of
the things which intrigues me about the TRF designs in general, since
the tube-o-philes want very clean sound from their components. Can a
super-het design accomplish the same sound quality? Probably, but I'm
still intrigued with the TRF....

Jon Noring