I know I'm starting to sound like Marco with my unfeasibly benign micro-climate, but the sun really is shining here! Sorry Macca, maybe I'll get some...
Double check that you have the speakers connected correctly left and right. If not, it could be the reason the other channel hums when you touch the...
I'd rather have an amp that only hummed when I touched it than an amp that only hummed when I didn't touch it. I'd struggle to enjoy listening to the...