I can receive short wave radio stations with my Rega RB300, modified with the Incognito rewiring kit (Cardas). To turn them off: unplug the FM-antenna(s) from your tuner, twist the interconnects from the turntable to the phono amp and take care of proper grounding of your arm/turntable by connecting a ground lead to the phono-amp. This even lowered the noise (hiss) level a lot.
Hope this helps you too. Good luck!
Hope this helps you too. Good luck!