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Question for tube aficionados

I have a vintage Conrad-Johnson PV 11 preamp.
 I’ve always re-tubed it  with the cheapest tubes from Tube Depot (e.g. Electro-Harmonix 12AU7 and 12AX7, Sovtek 5751 and the like.). I’ve been very happy with the sound.
 My question is:
 Would it be worthwhile to spend more money on more exotic tubes?
  Would there be any appreciable difference in the sound?
 I’m powering the system with NuForce Reference 9 V3 monoblocks.
128x128rvpiano
oddiofyl's avatar
oddiofyl
3,464 posts
 
The new mullard 12ax7 are very good....
audioconnection
1,270 posts
 
Amperex Nos or decent testing units 12AX7 
orange globe 
rvpiano's avatar
rvpiano OP
2,437 posts
 
Thanks to everyone for their suggestions.

My speakers are modified Dalquist DQ 20’s.

Overall, the system is fairly well balanced.  What could be improved is occasional brightness in the treble, especially in the line stage.

 Ideally, I’d like to replace all six tubes, depending on the cost.
roberjerman
4,319 posts
 
Vintage pre-1970 GE, RCA, Sylvania, Mullard and Telefunken are still the best made and sounding of the 12a*7 types! Far better (and longer lasting) than present day production! That is why they command high prices!
roberjerman
4,319 posts
 
Cheap present day 12a*7 types will never equal the sound quality and lifespan of vintage types!
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