1/2 Amp = 500 mA(#74727, on the following page): http://www.partsconnexion.com/fuse_hifituning_supreme_lrg_sb.html That's the correct fuse for the Pass XP-20's 220-240V power supply. CHEERS!
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Power up surges are very common and blowing with them Is a common experience with "hi-fi" fuses (there's actually a discussion of it on the HiFi tuning fuse page that @rodman99999 referred you to). It's not as if 625mA is going to harm your kit anyway if 500mA is safe. With the gear I have that's prone to it it happens maybe 25% of the time and I've learned to step up a size to avoid it.
I get get my blacks from Alfred Kainz at high end electronics so maybe ask him if he has any advice on your particular situation
I spaced your request for info on the Synergistic Black. My Hi-Fi Tuning Supremes are also black(in color), and my feeble brain made a sideways leap & erroneous connection (sorry) . Here’s the correct page for the requested fuse(#81129), in case you haven't found it yet: (http://www.partsconnexion.com/fuse_syn-blk_lrg_sb.html) This page also makes brief mention of the potential in-rush current/link metallurgy issue(silver vs steel or nichrome).
@infection thanks for that. My philosophy is to make few changes to the main components but to invest a lot of time (and unfortunately also $) in optimizing how they sound. I suspect most comments of the "A smokes B" variety merely reflect a system setup that suits B rather than A. In other words system synergy is all, but it takes a lot of work and time