ErictheRed V.I.P. Member Joined Dec 8, 2009 Messages 6,720 Reaction score 8,773 Mar 3, 2021 #21 BadPenguin said: Soo, obviously, it's NOT the guitar, right? Bad cable, bad effect cable, bad amp. Most likely the main cause. Click to expand... Not necessarily, two guitars could have poor wiring. If he unplugs the guitar and the hum is still there, THEN it's definitely not the guitar!