that's not crosstalk, that's bleedthrough...

it's fairly common with receivers, the tuner is constantly "on", and producing frequencies that are being picked up by the preamplifier (they are really close to eachother), it's due to inefficient shielding...

you shouldn't be able to really hear it while music is playing though, more like when you have no music playing, with the volume turned up completely..;

nevertheless, most likely this is a shielding problem, and this is not easily solveable, without some inventive DIY'ing...

Keep them spinning,
Bert.