Moonguy and Spacer, this is very important:
Furutech fuses available in the USA are of the slow-blow type. Do a Google search. Furutech calls them time lag or time delay fuses.
If your big power amp uses a slow-blow fuse (there is a "spring"
inside slow-blow fuses), it is OK to replace with a Furutech fuse of the same rating.
Tube amps, CD players, DVDs, preamps and other Hi-FI stuff rarely use slo-blo fuses, for a simple reason: they take too long to open in case of a current peak.
DO NOT replace a regular (fast) fuse with a slo-blo fuse. In the event of any internal electrical failure, a slo-blo fuse will stay put and your gear will go up in smoke. Your warranty and home insurance DO NOT cover fires caused by the wrong kind of fuse, no mater how expensive they are.
Please read this before it is too late:
http://wiki.answers.com/Q/How_many_second_it_takes_the_fast_blow_fuse_to_blow