Hey all, been reading here a lot, just signed up hoping I could get some help. I've searched far and wide, read many posts here and elsewhere, still in the dark. I'm just getting back into playing after about a decade, so please bear with me! I just bought a used Fender 57 Champ reissue and it's got a noise issue, maybe that's why it was priced so low. Unfortunately I didn't notice it in the store. Here are some details: - Amp on, no cable plugged in, no hum at any volume - Cable only plugged in (no guitar), it starts humming at amp volume 4 (of 12), hum volume increases with amp volume, hum drops about 50% if I touch the metal cable end cap - Guitar plugged in (single coil tele or humbucker epiphone), guitar volume on zero, no hum at any amp volume - Guitar plugged in, guitar volume on full, hum is present, increases with amp volume, no reduction in hum if I touch the cable end cap, the strings, etc - I believe it to be 120hz Additionally, I tried multiple power outlets, multiple rooms, tried the 3-prong to 2-prong converter, tried a surge protector, none of this had any effect. I only own one guitar cable, so can't rule that out, though it's brand new. Unfortunately I haven't owned an amp in a long time so I'm not sure about the wiring/grounding in my 100+ year old apartment. Also haven't tested outside my apartment, but will tomorrow. From what I've gathered it's a grounding issue, so I'm mostly trying to discern if it's in the amp or from an external source. Again, I'm a novice so please correct me if I'm way off. Photos attached in case they're of any use. Thanks in advance!