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Conrad-Johnson PV 11 preamp tube dilemma

I recently made changes to my system that altered the character of the sound.  After installing Morrow MA4 interconnects between preamp and DAC, and preamp and amplifier, the sound became duller.  By switching from two 12AU7 Telefunken tubes to Amperex tubes in the line section of the preamp, CDs started sounding wonderful. The problem is the phono section still sounds very dull.
In the tube section I’m currently using two Electro Harmonix 12AX7’s, one JJ-5751 tube and one Mullard 12AU7.
Can anyone suggest a tube complement that would brighten the sound of the phono section?
128x128rvpiano
uberwaltz's avatar
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uberwaltz
4,946 posts
 
Just from my experience no matter what pieces I have in my system the only cable brand I have tried and that I hear consistent improvement with every tier I move up is Nordost.

I know a lot consider them to be very overpriced, flat, hollow sounding but just for me they have consistently worked.
rvpiano's avatar
rvpiano OP
938 posts
 
lowrider, 

Took your suggestions for the 5751 (RCA blackplates-triple) and 12AU7 (RCA cleartop Ecc82.)
i spoke to Brent Jesse about the 12AT7’s.  He suggested Raytheon.  I’m getting them.
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lowrider57
3,018 posts
 
Sounds good (I hope). Definitely let us know how it works out... 50 hours for full burn-in.
rvpiano's avatar
rvpiano OP
938 posts
 
I will!
tubegroover
2,279 posts
 
Agree with Stereo5, why waste time installing tubes to compensate for a dull perception caused simply by installing new interconnects? No need to overthink, this is not a tube issue, could be a cable breakin issue or maybe a case of it taking time becoming acclimated to the differences.


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