I,ve recently bought a new amp and was gonna get rid of my old one (crappy 10w toneless piece of sh**e) then i thought what would happen if i run my guitar thru the old amp into the new one? would this effectively give me a 10w pre-amp? will it give me more output overall?? (new amp is 15w) will it blow the pre-amp and/or output circuit (solid state) in the new amp? or will it just do nothin? any info on this grately appreciated guys, cheers.