Phono Pramps are matched to the phono cartridge. The good ones, anyway. 47 K-Ohms input impedance with some number of picofarads shunt capacitance, etc. etc. If you plug a turntable into anything else, the RIAA curve will not be accurately subtracted from the music.
Everybody laughed when I told them Radio Shack still sells a phono-preamp, but I also bought Something Else that seems like a good deal and it's well made. I haven't had time to fire either one up yet, and I can't remember the name of the better one.
If I can be any more help, let me know.