I would agree. The slo blow fuse that was in my ARC sp16 looked quite substantial and nothing like the slo blos we used to sell at Radio Shack. Some thought appeared to go into it. So I don’t think its safe to say that those making our gear always give fuses the short shift. There are many reasons why ARC has been as successful and been around as long as they have. They make great sounding gear to start.
Also I noted earlier that back in my hifi sales days, I recall convincing myself that slo blo fuses made more sense for use in hifi gear than fast blo and developed a preference for those based on teh gut feel that every slo blo fuse I have seen has a more substantial filament and is more forgiving of current passing through and I think its a safe assumption that teh fewer bottlenecks anywhere the better..
Its also almost always the case that one can only judge something new in comparison to what came before it. The quality of fuses being replaced by audiophile fuses surely varies widely. That alone could account for why different people hear different results. I tend to downgrade any review of any product when the reviewer fails to acknowledge what the gadget he thinks sounds so great is replacing.
So for me, its never been about whether a fuse can sound different or not. Its more about the value proposition of various options. $100 is small fry to pay as part of a 5 digit system. Yet there may well be other commercial fuses out there of similar quality still for less than $1. That’s still a huge difference to justify. When the time comes to replace a fuse, I will surely still consider all the alternatives based on pure technical merit. If the $1 fuse does not cut it, no big loss.