I am a Bodom fan, and came across a Lee Jackson Gp-1000 pre amp.....i was wondering what the purpose of these are?....is it just to boost output and gain so to speak?....and how does it work....like does it just plug into a Head, or amp...or what?
A preamp amplified your signal to line level and then the poweramp powers it so that it could push speakers. It is essentially one half of a guitar amp head. Read the sticky, foo'.
It says in the sticky!