IICR the preamp took the distorted music data from the record, corrects it, amplifies it to a level the amp is expecting, ready for further amplification. If you don't have a phono input to your amp you'll likely need a preamp between the deck and the aux input on your amplifier. But if your deck has a preamp, then I believe it should work directly.
If you want best results chat your requirements over at a local hifi shop where knowledgeable enthusiastic folk can advise on their products.