1. A pre-amp, in most cases, is the part of an amplifier that controls the tone and overall volume of the amplifier. In the case of a guitar amp there are usuall three components:
Pre-amp - volume, tone, reverb etc.
Power-amp - actually supplies the power
Speaker enclosure - self explanatory
2. An ABY box allows a musician to route a single instrument to two different amplifiers and switch between the two at will
3. an amp head is simply an power amp/pre amp combo seperate from the speaker enclosure. Ever see someone playing through a stack? an amp head is the big rectangular box on top of the cabinet with all the knobs on it.
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