Check your power supply. Make sure that your amp is plugged into a grounded outlet. If you're using an extension cord, make sure it's a heavy-duty cord that's in good condition.
Try a different outlet. If the hum persists, try plugging your amp into a different outlet. This will help you determine if the problem is with your amp or your outlet.
Check your cables. Make sure that your guitar cables are properly shielded and in good condition. If you're using any patch cables, make sure they're also properly shielded.
Try a different guitar. If you have another guitar, try plugging it into your amp to see if the hum persists. This will help you determine if the problem is with your amp or your guitar.
Check your amp's grounding. Make sure that the amp is properly grounded. This can usually be done by connecting a grounding wire from the amp's chassis to a grounded outlet.
Use a power conditioner A power conditioner can help to reduce hum by filtering out unwanted noise from the power supply.
If you've tried all of these tips and the hum is still present, you may need to take your amp to a qualified technician for further diagnosis and repair.
Here are some additional tips that may be helpful:
- Move your amp away from other electronic devices. This can help to reduce the amount of interference that your amp receives.
- Turn off any unnecessary electronic devices in the room. This can also help to reduce interference.
- Use a noise gate. A noise gate can help to reduce the amount of hum that is picked up by your guitar.