I have a 1990 sony D-11. It can easily power HD600 headphones (I have tried), and it is in excellent condition, with only a small white mark on the cover that could be removed with some sort of cleaner possibly. It comes with a car adaptor plate that has a car cigarette plug in and tape adaptor. It also has a hand strap. It takes 4AA batteries (no lead-acid battery). It has a line out on the back. I will post pictures soon.