Hi My AS50D has developed a loud hum
It doesn't change if If connect different guitars or micsand changing the input levels has no effect
But it does get louder with the master volume
It sounds like a problem with the power supply is it an easy repair?
I live in the far north of Scotland so shipping is a problem
Here is a video of the hum
Regarding your AS50D looking at the video it is very hard to hear the hum and give a diagnosis, we would be happy to look at the amplifier for you and we can arrange collection if the amplifier is boxed up safely and we give a free quote. If you would like to make any arrangements or have any questions please contact our returns department on 01908 375411.