Phono preamp design


i was always curious how the phono preamps are designed: how many amplification stages, feedback... is there any phono preamps with no neg.feedback or its presence is mandatory in this case?
Convert?fit=crop&h=128&policy=eyjlehbpcnkioje0ota2mjc1nzcsimnhbgwiolsicmvhzcisimnvbnzlcnqixx0%3d&rotate=exif&signature=4356f596657eaeca2a4435ad5ab87efbfecf7326758745206fde0389e9f9831f&w=128marakanetz