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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
rvpiano's avatar
rvpiano OP
2,488 posts
 
Grammar Correction: The Belles amp WAS not........
twoleftears's avatar
twoleftears
5,313 posts
 
What are the speakers, that need such a firm grip?
rvpiano's avatar
rvpiano OP
2,488 posts
 
Modified Dalquist DQ 20’s.
The Belles just didn’t push them hard enough for impact.
twoleftears's avatar
twoleftears
5,313 posts
 

Interesting.  The figures in this review suggest an average-ish impedance curve.

http://www.hifi-classic.net/review/dahlquist-dq-20-243.html

Did the modifications make them harder to drive?

rvpiano's avatar
rvpiano OP
2,488 posts
 
Could be.
 The bass response is far better than the original was.
Really quite impressive!

The main thing, though, is that it just sounds better with the NuForce.
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