do a blind test. have someone disconnect the ICs from the tuner and listen to your cd player. If you can identify 100% when they are plugged in, then it affects the sound.
Some preamps leak from one input to the other, so if you have a tuner on and listening to cds, it may affect the sound I guess if the preamp is leaking. Also try switching to the cd input without the cd playing and see if you can hear your tuner. Raise the volume on the preamp but don't forget to turn it down before you hit play on the cdp.
Some preamps leak from one input to the other, so if you have a tuner on and listening to cds, it may affect the sound I guess if the preamp is leaking. Also try switching to the cd input without the cd playing and see if you can hear your tuner. Raise the volume on the preamp but don't forget to turn it down before you hit play on the cdp.