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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.

Need replacement tube

Okay - so my beloved K2 is apparently having a problem with the factory tube. For the first 30 minutes of a session, it sounds fine. After that, the mic starts to get very thin and muffled to the point where it eventually stops receiving/sending signal at all.

So, I'm looking for a replacement but I'm not good at which tube can replace what with minimal problem.

dbx DDP upgrade/replacement or find some additions?

I'm still using a DDP as my main compressor/limiter. I've had this thing for about 5 years now and have not had any problems. And I know there's others that'll make it look as if you're using this thing like a Alesis 3630. What I'm wondering is, will I need to upgrade to a better compressor or have an additional compressor added? My other's are software based.

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