The PR14 is basically a PR10 with a remote. It uses the same circuit topology, a single triode buffered by a cathode follower and sounds about the same. This is a tried a true design that is still used by numerous manufacturers so I would not worry about the age. If you can live without a remote and the price is good I would try the 10.
The PR17 is a different beast, it has the same composite triode topology as the 16, ART, and ACT.
The PR17 is a different beast, it has the same composite triode topology as the 16, ART, and ACT.