the title says it all and i have no idea wat it is can u guys help me
The pre-amp is the something that will take your guitar's signal and amplify it, before it gets to the main circuit of the amp. Power amp then amplify the signal post circuit so that the signal can drive the speakers. It's also where most of the crunch of distortion comes from.
i tried using wiki for this already but i didnt get it
In a guitar amp, there are 2 parts of it. A preamp, and a poweramp. The preamp is what shapes your tone. When you turn a knob on most amps, you're affecting the preamp section. The gain and tone controls are in the preamp. The poweramp is what powers the speakers. That's as simple as I can put it