If you still hear the amp humming, then there may be an issue with the wiring or the equipment the amp plugs into.
You may not be able to completely get rid of the interference, but it won’t be as noticeable.
Wall sockets have slightly different voltages when you plug into them, so connecting 2 pieces of equipment between them creates a difference in frequency that makes the amp hum, called ground-loop feedback. Never remove grounding prongs or use 2-prong adaptors for your amp. Otherwise, you aren’t protected from electrical shock.
Hum-reducing adaptors usually cost around $80 USD, and you can buy them online or from music stores.
Avoid using cables that are pulled tight since you could damage their internal wiring.
You can buy a ferrite choke online or from your local electronics stores. Some cables will come with ferrite chokes already built into the wiring.
If you can’t take the equipment apart, then you may need to replace it. You can also try cleaning out the port on your equipment.
Always keep multiple cables with your amp so you have spares if you need them.
If your amp still hums, there may be an issue with other equipment you’re connecting to it. Always turn off and unplug your amp while you’re working on the internal electronics so you don’t shock yourself.
If you’re not comfortable taking apart your equipment, check if there’s a manufacturer’s warranty so you can have it professionally fixed. Otherwise, you may need to replace it.
