Kraft did make the legal narrow band, AM and FM. Most of the older Kraft AM was easily updated to 91 standards at the time, did not cost to much at the time. I believe FM was always narrow band. If you have an AM you will have problems getting new receivers. If it is FM then it like JR in shift if you need a receiver. If you can put a picture up or two we can help you. There are still one or two places that can service the RF now.
They are pretty nice units.
Greg