Synergistic Research Orange (but with the caveat to go up at least 25% from spec). Audio Magic Ultimate Beeswax second (spec ok; don’t know about the Ultimate Premium because the one I had broke while trying to pull it to change its direction, and so won’t be dealing with them again). Not all aftermarket fuses are created equal, anymore than our ears or pocketbooks are (which affects the what people say they like and recommend). I’ve tried several brands/models, but not all.
Think of the power fuse as an extension of the power cord, the last step on the way to the most important part of any electronics, the power supply. Thus, fuses can potentially do sonically much of what power cords do. Here we spend all sorts of money and time fine choosing power cords, but then leave that least link as a mass produced cheap OEM design. So things tend to gravitate toward the least common denominator (not all the power cord’s effects are lost).
Think of the power fuse as an extension of the power cord, the last step on the way to the most important part of any electronics, the power supply. Thus, fuses can potentially do sonically much of what power cords do. Here we spend all sorts of money and time fine choosing power cords, but then leave that least link as a mass produced cheap OEM design. So things tend to gravitate toward the least common denominator (not all the power cord’s effects are lost).