Fuse upgrades? -- 6.3 amp 250v 5X20mm fast blow fuses

Yes, audiogon is suffering from a lot of web site errors and instability this weekend.  I usually "copy" my entire post before hitting "submit" just in case the site jinks.
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Yeah, I agree that the cheap fuses with nickel plated end caps are not that great.  I just did a comparison of cheap ceramic fuses between Bussman and Littlefuse.  In this case, the Littlefuse brand won out.  The Bussman had somewhat of a warmer/slower sonic signature.  The Littlefuse did not have this warm signature and was clearer/cleaner.  That being said, it was a stop-gap and I already have a couple of Hi-Fi Tuning Supreme fuses on order to replace these, lol.
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However, I don't necessary agree with teo_audio that you want silver-plated brass.  1 - silver plated can be useful, but in some situations it is just too fast/bright/harsh.  2 - Brass has never had good results whenever I have tested with it.  Brass usually pushed too hard on the signal and can come across as too strong/harsh.
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Furutech have wire/end-caps are pure copper that is Rhodium plated.  Hi-Fi Tuning Supreme is a silver/gold mix for the wire/end-caps.  Both are excellent, but have different results.

The better fuses from the mentioned companies have beryllium copper end cap available, IIRC. Brass is the second down on the preferred ’cheapies’ list. so,silver plated beryllium copper or what is normally available: tin plated beryllium copper end caps. IIRC, of course.

Digikey probably has the best search engine around for figuring all this out, re targeting the desired items...

Honestly, I would rather get tin-plated beryllium copper (which is usually mostly copper with 2-5% bronze) then the most expensive silver-plated brass.  The tin plated copper is not that bad and it is definitely more neutral than silver plated or gold plated.

sleepwalker65" That is a very ignorant statement. When you try to dismiss electrical principles as falsehood, the only thing left is magical thinking...superstitions and hokum...pixie dust and magic chicken’s feet... audacious claims... perpetuating mythology... fantasy world..."

You're insistence that your command, knowledge, and expertise in audio is that of an expert, authority, and engineer is patently laughable on the face of your protestations, pronouncements, and dictums. You have the active fantasy life of a small child, where you think the "real world" is what you believe based on an assumption that the world is intuitive and that you are adequately educated, informed and  knowledgebale to divine and ascertain truth from your view from the mountaintop of ignorance, confusion, and disorientation.