I recently bought one of these Pyle Pro Phono Preamp’s, and its actually come in handy recently. I’m not sure what/who it was made for specifically, since it essentially just converts the phono output of a turntable to line level. It’s supposedly for people who want to connect a turntable to their stereo without using a mixer or a preamp similar to this one(which are usually much more expensive), but I thought most stereos came with phono inputs..maybe I’m wrong. Either way I’ve been using it to connect a third turntable to the AUX channel on my mixer.  Perfect if you want a 3 turntable setup, but you only have a two-channel mixer.

You can get one HERE