Is my guitar amp blown or loose connection?

Yesterday i purchased a Peavy 112 Valve King From Guitar Center i plugged into it when i got home and i tried the clean channel first. it was not even loud or medium loud, it was very soft and couldnt hear it much and this was at full volume cause i turned it up to see if the clean got louder. I then went to the Distortion channel...... it sounded different i thought it was cause its my first tube it sounds different but at band practice today my friends said it wasnt it sounds like very fuzzy when played even with very little gain on the lead channel. it goes from sounding fuzzy or crackling. Is there something bad with my peavy or is it just normal?