Replace CJ with new equipment

You know, I got to hear the Audio Research tube integrated recently and it was really quite nice. Kind of straddles the older ARC clinical sound with modern warmth. Not CJ like juiciness, but more towards Parasound like warmth

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.