I've got an old Goodmans amp, all it's connected to is the speakers and a Sony CD player, but recently there has been a loud hum coming from the speakers whenever it's on. The hum isn't affected by the volume knob. I've tried disconnecting and reconnecting everything, and also had a look inside the amp - nothing obvious.
So is the amp dying?
Cheers 😉
also known as a ground loop
you need to do some fault finding testing - switching to other sources etc etc
Sounds like an earth problem, possibly? Check the earth on the plug, maybe a loose connection internally? I'm no electronisist, but a hum usually indicates earthing issues, or maybe a transformer.
You need an expert really... 😀
The amp isn't earthed, which struck me as a bit odd too - it's double-insulated according to the label on the back. There is a ground screw - worth connecting that to earth?
If its anything like my kef speakers it will be a capacitor somewhere.