Without model numbers I can't give you an exact answer.
Does your receiver have a built in phono preamp?
Is the Crosley a record player (with speakers) or a turntable?
Is there a switch on the Crosley to turn the phone preamp on and off?
The crosley turntable is a c200 and i think it may have a built in pre amp. I will be home this evening. It was a xmas present for my daughter. So checking around on line maybe it has a switch to turn pre amp off.