Chaos theory suggests that a tube preamp, especially one that employs zero feedback, will actually get you a better noise floor. Not- mind you, a quieter one necessarily, but one that is more pleasing to the ear.
In addition, it will have less of the harmonic distortions (in Chaos Theory this is known as bifurcation) that interfere with how the human ear processes the volume of the sound. In a nutshell, it will sound more relaxed for a given volume.
Another phenomena of tube preamps, especially zero feedback preamps, is that despite having the same bandwidth as other phono sections, you will experience less surface noise from the LP. Again, Chaos Theory explains why- with no feedback there is no bifurcation of high frequency events like a tick or a pop.
Fun stuff huh?