Remember, that first fuse did blow. Very likely thermal stress over time had worn the filament, but gradually so you didn’t notice.
In any case it is easy to understand. A great deal of very critical power goes through the thinnest wire in the whole system. A wire deliberately intended to be just barely thick enough to not melt every time you turn it on. Not exactly ideal design parameters for sound quality. No wonder when the design goals shift to improved power transmission aftermarket fuses prove they are worth every penny. In other words, you ain’t heard nothin’ yet.
In any case it is easy to understand. A great deal of very critical power goes through the thinnest wire in the whole system. A wire deliberately intended to be just barely thick enough to not melt every time you turn it on. Not exactly ideal design parameters for sound quality. No wonder when the design goals shift to improved power transmission aftermarket fuses prove they are worth every penny. In other words, you ain’t heard nothin’ yet.