I had a PV 10A. It was a my first tube pre-amp.
Did some tube rolling and had a lot of fun with it.
It does have a classic tube sound. Rolled off top,
bottom end is a little soft and lush mid-range.
My understanding is that the PV-10B is the upgraded
version of the PV-10A. Never heard one though. I agree
with Kw6 that the 17LS would be a huge upgrade from
either of the PV-10 units.
Cmach