Hi, my first amp Boston 40W has just started to crackle and buzz when i play my guitar.

Ok it all started today i turned my amp on this morning went to have a little play before school and the amp started crackling like bad distortion. I thought at first it was the lead. This afternoon I plugged in another lead and another to find my amp is the one with the problem.

Ok pretty much what happens when i touch the strings or play the usual sound is accompanied by a crackle or buzz, its not good. plus the normal sound can only be heard with the crackle whilst the gain knob is at full or close to it otherwise it is just crackle and buzz not alot of guitar sound.