Tube preamps differ from solid state preamps it seems in the fact that tubes exhibit good distortion. Distortion in this case is not a bad thing. It changes the sound in a good way; puts a good effect on it. The distortion can add harmonics that we can't find through the instrument or voice alone. Both tubes and solid state preamps are great choices and both, as long as they are in good condition and built well, work just as we need them to in the signal path, doing the job they are meant to. It just seems from experience and from reading that tubes can handle more and can give us effects we just can't get from other devices. 

	Mics and preamp impedance is matched basically through experiment and testing to see what sounds you like most. Different preamps let you adjust the sound differently, it will depend on what is heard by the ear, adjusted to the liking, and adjusted to fit the input and output voltages of the two.

	Multiple preamps is a huge plus and necessity in the studio. Preamps are all built differently, let you adjust the sound differently, and give the sound a whole different feel and much needed effect or adjustment. Each preamp is built to handle different sounds, whether it be a guitar, a vocal, a drum kit, or a whole band/orchestra. Depending on your source of sound, determines which preamp is going to do the job that the artist, engineer, or producer is looking for. Multiple preamps give multiple options to get the right sound. 

	Microphone preamps, I found, only boost the quality of an amp to a small extent. Each, as long as they are working properly and a good quality, are doing what they need to in the chain of recording and are going to give you exactly what they are built to give. The microphone preamp is only going to boost the quality of the amp by changing its EQ, boosting, or compressing the sound. It's not going to dramatically boost the quality of the amp; nothing that is going to be reasonably noticeable.