Not sure this exists under $500. But if it does, I definitely want to know about it...also, per my own experiments with different gear, a tube pre with a SS amp or a tube integrated will best a SS pre with a tube amp. Just my experience.
Look at Jolida, probobly used. Try to get one of the more recent models.
Look at Jolida, probobly used. Try to get one of the more recent models.