I put off fuse exotica for as long as possible, but recently anted up $12 for an Acme cyro-treated silver ceramic fuse. This was very much worthwhile in a BAT tube amp and a "bargain" relative to $60.
Upgrading Fuses
Have a Audio Research Ref 3 and am considering upgrading the fuses but I am a little skeptical. Would like to hear from people who have try this. Hard to believe that fuses can make a substantial difference like the manufacturers claim. All advice appreciated.