Howdie everybody! Ive recently created an account but i've lurked for a while. As the title states, i've got a jc-120 that does not produce sound when my guitar is plugged in, regardless of what channel i am plugged into. I've plugged my cellphone into all channels and get about a maxed cellphones amount of volume as well as occasional popping from the speakers. Just was wondering if anyone has run in to this problem before. Transistors? Bad solder joint or cable. Thanks for your time!