Another experiment, if you are interested. Try placing the amp in a couple of different spots within the room, and facing it a few different directions. Also, while holding your guitar turn around slowly while listening to the hum for any change. That may help clarify whether the noise is wiring based or from the surrounding environment.
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"You don't have to be great to start, but you have to start to be great." -Zig Ziglar
Acoustics
2013 Guild F30 Standard
2012 Yamaha LL16
2007 Seagull S12
1991 Yairi DY 50
Electrics
Epiphone Les Paul Standard
Fender Am. Standard Telecaster
Gibson ES-335
Gibson Firebird
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