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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
lowrider57's avatar
lowrider57
5,397 posts
 
Sounds good (I hope). Definitely let us know how it works out... 50 hours for full burn-in.
rvpiano's avatar
rvpiano OP
2,488 posts
 
I will!
tubegroover
2,320 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.


stevecham
3,340 posts
 
Put some new JJs in there, that will brighten things up.
rvpiano's avatar
rvpiano OP
2,488 posts
 
Kudos to those who said “wait for the Morrow cable to break in.”
Indeed, the cable changed character and the sound is terrific now. I’m  sticking with the original preamp tubes.
Evidently the tubes in the phono section I bought because they were the cheapest I could find, work wonderfully with my preamp.
I also added high quality power connects to my amps.  That might have had an effect too.

Next time I’ll be more patient.

Thanks for all the suggestions though.
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