That is, if the preamp amplifies the instrument signal, why is a poweramp necessary at all?
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Preamps make very quiet things louder very cleanly. Power amps make things very loud, but if you only used a power amp you would end up with a loud sound with a lot of noise.
Imagine you had a picture of a stamp and you wanted to put it into an overhead projector. If you put a low-res image straight into the projector and made it huge it would look terrible.
But if you used a good scanner to get a larger, clean high resolution image of the stamp first, then pass it to the projector, it would look a LOT better.
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