It won't really add any warmth, if you think tube preamps do that you're somewhat incorrect. Not that some tube preamps don't add character but any preamp can add what you perceive to be "warmth". In fact some of the nicest "warmest" preamps are solid state. That being said the MPA isn't a bad pre at all. I've actually been using one quite a bit lately. What really makes this preamp nice is the variable imperdance which can drastically change the tone of the mic. If you want to hear it in action go to myspace.com/alavera It's definately not one of my better recordings and it's screamo or hardcore or whatever the fuck you wanna call it but anyway, just about everything went thru it. Snare, Kik, Vox, Amps, and DI Bass.