Getting FM from my speakers without a receiver???

Yes, all gear is connected thru an APc power conditioner.
Thinking about a wiring upgrade for the Basis TT, since this would improve the sound and perhaps provide shielding that is not on the current cable.

Do you have any gear with a switching powersupply?
Such power supplies operate NEAR Intermediate Frequencies of both FM (some) and more common AM radios. I have no basis for thinking this could actually happen.
As for shielding, a better cable would work better than either copper foil or mesh around wires. It would be a mess to boot.

Have you tried a power conditioner? This goes back to my first line in this post... It may be coming in over the power lines, though the phono pre seems 'the magic bullet' .

post if you find the final root cause / solution

Bad amalgam fillings you say? Would be cheaper to replace analog gear than pay $$ to my hi end dentist. I am researching wiring upgrade presently and that route sounds like it would improve the sound quality anyway.
The station is Fm and they do not broadcast a duplicate signal on Am to my knowledge.
What could I place over cables to shield them?

I had to get rid of all my amalgam fillings for this very reason.

Congrats on tracking it down. The better cable suggestion should show a result.

The AM band is fairly long wavelengths, so I'm sure that changing 'antenna' orientation would help, but that should also be tried.
You could also try secondary shielding OVER the offending cables. Ground it at only 1 end.

Sounds like a good bet to me. Unshielded phono cables strike me as an invitation to this kind of problem, considering the low signal levels and high gain factors that are present.

I would suggest, though, that you verify that you don't hear the radio signals with the Linn preamp when nothing is connected to its phono inputs, and/or with shorting plugs connected to its phono inputs if you have them available.

The different results between the two preamps are likely due to the happenstance of the different characteristics of their input circuits -- one demodulates the rf signal and one does not.

Also, similar to the discussion in the other thread that I linked to, I suspect that you are really hearing am, not fm. I can't envision a means by which an audio system, apart from a tuner, can demodulate an fm signal.

Regards,
-- Al

OK so here is the update. I switched from my Linn preamp to a spare Parasound I have and the FM went away! The cables from the Basis TT to the pre amp appear to be pretty cheap and unshielded. So now I wonder if I rewire the TT cable wll th RF go away???

If this happens only when the preamp is switched to phono, try a different set of cables to see if the RFI goes away. You may need shielded low capacitance cables between your tt and preamp.

Wow, I had the same thing happen to me this evening. Assumed it had something to the phono pre to pre amp cable I swapped out before my listening session. Sounded like one of the political guys from Fox News. It was very clear and a single broadcast. I read through the link Almarg posted above and will pursue a few of the ideas if I continue to have issue. What a small world.

I think you'll find reading through this thread to be worthwhile:

http://forum.audiogon.com/cgi-bin/fr.pl?htech&1230309974

Good luck!

-- Al

Aliens,have infiltrated your stereo.Seriously though,check out some of the threads here on RFI.Lots of good suggestions to minimize or get rid of the problem.Good luck.BTW,are the aliens green or silver!!!!!