I'd look into replacing preamp tubes.
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Try hooking up the pre and power amps normally, with the interconnect that would connect to the CDP in it's usual position(but w/o the CDP). Turn up the volume on the pre(Don't touch the interconnect) . Is the radio signal there? If it is: Turn the volume all the way down, remove the CDP interconnect and turn the volume up again. That should tell you if the most likely antenna in your system is the culprit(the CDP interconnect). Second would be the pre itself. Try some shorting RCA plugs, if that's the case. For instance those mentioned halfway through this article: (http://www.sixmoons.com/audioreviews/acousticrevive/ground.html) If you don't want to spend the $275 on those plugs, here are a couple other suggestions: (http://www.cardas.com/content.php?area=products&content_id=7&pagestring=Accessories&product_id=29) Music Direct, Needle Doctor, Audio Advisor and Galen Carol all sell those. Then there's the cheapest route:(http://www.siteswithstyle.com/VoltSecond/Shorting_plug_rca/shorting_plug.html)
Poorly shielded interconnects are often acting as antennae, so try is to replace yours w/the cheap interconnects that typically come w/olds vcrs(2 wires, white, red, & yellow). They sonically are lousy, but they are usually very well shielded because JVC, Sony etc, expect their customers to have many wires often tangled. If they eliminate the trouble, then shop for highly shielded good sounding interconnects.
Physical line of site to radio signal often comes into play, so try moving gear away from windows, and/or turning gear 90degrees, it might help. Cheers,
Thanks for all your helpful advice everyone - and sorry for my delayed response. (My job popped a surprise worktrip on me and I've been out of town for a couple of days.)
Mrtennis, I'll pm you about those rfi chokes. Woudl like to give them a try though I'm using Audio Metallurgys and need to figure out if they'll fit around them.
I'll also try to further isolate the problem as suggested when I get home tonight. In the meantime, I was looking at a PS Audio Duet (I'm on a budget here!) Does anyoen thing that might help reduce the rfi problem?