Question for tube aficionados

Rvpiano,
I’m not surprised that you notice such a significant improvement in the sound quality. The point numerous posters have made on this thread is true, better quality tubes are unquestionably impactful. Congratulations. I didn’t understand the comments of some who suggest that there wouldn’t be much of a difference. Average quality tubes will only restrict/limit the true potential of your preamplifier. The basic design and circuit of the PV 11 is good, but held back by mediocre tubes in the line section. 
Charles

I'd agree that not all NOS tubes are genuinely "new" old stock and a reputable dealer is worth seeking out.  
Not every NOS tube is by default always better than current production,  it depends on numerous variables.  I can vouch for the upper level of the Psvane tubes for example. 

Based on my experience I believe that you can find high quality NOS tubes if using a honest dealer/vender.
Charles 

+1 lowrider57. I’m not suggesting that the CJ recommended tube option is a bad one. For that cost I’d would pursue the NOS tube pathway. I like the idea of trying the RCA tubes as earlier considered above. I’d have CJ clarify if their tubes are NOS or current production. Again their choices may be very good sounding. Truth is there are many good tube rolling options for the 12AX7 and 12AU7 family.

Charles

Rvpiano,
I’m looking forward to your listening impressions of the RCA tubes in the CJ preamplifier. Curious to know how much of a difference you hear compared to your current tubes. I believe this is a good move.in terms of venturing into the realm of recommended NOS tube rolling. The cost of the RCA tubes seem very reasonable.  Good luck.
Charles

Rvpiano,
You’re using pretty decent tubes but as others have pointed out you can definitely move to a higher level for improved sound quality. You’ve been given some reputable tube vendor commendations. I can vouch for Vintage tube services. Much knowledge and very good selections from Andy. You can certainly exploit the CJ PV 11 true potential with better quality tubes. 
Charles