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ART Pro Channel Preamp Tube replacements

I have had this ART Pro Channel in my studio for years now and I would like to breath some new life into it. I ordered and installed Ei 12AX7 Elites and TungSol 12AX7 [ NEW PRODUCTION] tubes only to find that both had issues. The Ei's had +17 dB noisefloor over baseline factory tube. The TungSol tube has a bad harmonic distortion at about 300hz.