Replace CJ with new equipment

Check out Quicksilver!
http://quicksilveraudio.com/

The PV 12 doesn't need much of a rehab. If anything I'd replace the output caps and you'll have a whole new preamp. :) 
It was a significant step up from the 10 thanks to multi-stage voltage regulation and increased heater capacitance if memory serves.

But it has a juicyness and midrange warmth you'll be hard pressed to find anywhere else.

It may also be time to replace the electrolytic caps, of which they are few.

RHB Sound Dezign has modded more cj gear than any other brand.  Bob Backert is the force behind the company and can do as little or as much work on your PV12 as you care to do.  He has done extensive work on my PV12L which has elevated its performance well beyond its stock condition.

If you like what you're hearing, I would also say get it refurbed. Older CJs have a very specific sound that few others can reproduce. As long as you are doing it be thorough .