A “receiver” like your Vector Research actually has three components in a single chassis: An AM/FM tuner (for radio signals), a pre-amp and a stereo amplifier. Your new Yamaha is an “integrated amp,” which only has the pre-amp and amplifier in the chassis, and not the tuner. (Note that the Yamaha has an input for a separate tuner, while the Vector Research did not.)
Thus if you want radio you’ll have to buy a tuner. Search ebay for “Yamaha tuner” (or whatever brand suits your fancy) and you’ll find no shortage of vintage offerings. If you can find one, the Yamaha TX-950 from the early 90s was Yamaha’s last high-end tuner – a truly excellent yet under-appreciated example of the type.
If you just want to use the Vector as a tuner, simple connect its "Tape Out" jacks to the Yamaha's "Tuner" input.
Regards,
Wayne A. Pflughaupt