Does the station you hear change when you tune the tuner? If not, then bleed through is not the issue. You are receiving RFI frm the station. The high gain required for the phono board acts much like an RF preamplifier and he input stage of the preamp is acting like a detector. Try som clamp on RFI filters from Radio Shack. Also try some better interconnects between turntable and preamp and preamp to your line stage. Could also be a damaged ground in your tone arm. In any case, sounds more like RFI than bleedthrough since bleed through should be just as bad with a CD playing through the same set of inputs.
sensorman
sensorman