Alan and BrenR;
Thanks for the quick replies.

Well, I've used several preamps in the past; a H/K citation twenty-four, a carver (I don't recall the model number) a rotel RC-970BX, and I sold all of them because it all sounded pretty much the same... just with a little bit more or less THD.

And that's why I was using my friend's mackie in the meantime; but with the music I hear from my system with this preamp, the pluck of a guitar string on Eric Clapton's cds, or the resonant voice of Allison Krauss, I'm simply amazed.

I actually opened the unit up, fiddled around with the tubes a little; they have these metal caps to dampen microphonics I guess, one of them wasn't seated properly and it seems to sound better now.