Mains fuse in the neutral wire

[wpaulvogel]

That would be perfect. It would have protection on both the in and out.
In most any real world scenario we aren’t going to get a ground fault, something terribly wrong like a rodent chewing through a wire inside an amp or a chafing wire against the chassis? Really isn’t going to happen with descent dress and the amp secured to the cabinet. I was really just digging and picking on Marshall. Truth is that they don’t know what wire will be hot.