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One last question

Yesterday I was at a friends house and in his basment was a preamp from a combo amp Its from the ampeg ba115hp. I was going to start building a cab soon Im thinking of building a combo amp. Is it possible just to wire it right to the speakers for the cab ill be building soon? I got it for 20$. I think it still works I hooked it up to headphones and it works.
 
It's just the preamp? You must mean the whole amp, otherwise your plan is doomed. Also, building a speaker box is alot more complicated than you may think. Personally, I wouldn't attempt it, but if you do, good luck. There's bound to be info here that'll help you along.