Topmusicanswers
Isolate the Sound or Noise If the hum is no longer present, then it may be caused by either a ground loop or cable/pedal placed before the input or in an effects loop. From here you may decide to replace a power cable or use different configuration(s) to power your rig until the hum goes away.
How do I stop my amp from humming?
Find the dial labeled “Gain” on your amp's control panel and turn it counterclockwise. Keep turning the dial until you don't hear the humming sound coming from your amp anymore. If you still hear the amp humming, then there may be an issue with the wiring or the equipment the amp plugs into.
How do I know if a tube is blown in my amp?
Crackling, squeals and feedback, excessive noise and muddiness or low output are all evidence of tube problems. Power tubes. The two main symptoms of a power tube problem are a blown fuse or a tube that begins to glow cherry red. Either are typically indicative of a power tube failure.
