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Problems with my ART Tube Preamp

I just bought an ART Tube MP Studio V3 preamp, and am plugging it into the "line in" input on my computer. It just came in yesterday, and for the ten minutes I had to play with it I was Micing my acoustic guitar. I got a great signal. Today I plugged my electric guitar directly into it, and it was barely giving me any gain.

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.

PreSonus Tube Pre?

Does anyone have any experience with these? I've heard good things about them but am starting to get very skeptical about all this pro-sumer recording gear.

In short I recently bought a Firebox and have now realized that is has pretty wimpy pres... I'm thinking the TubePre might be a quick/cheap fix for me until I can afford a soundcard in a higher price range.

Thx