I was wondering about these for a Paul Hynes LPS, vs. an SR Orange.
From VH Audio: "The HiFi Tuning Supreme Fuses utilize a 99% pure silver and 1% pure gold alloy, tip-to-tip... from caps to burn wire. They also employ a specially developed ceramic casing, with an additional anti-resonance tube, as well as
quantum and cryogenic treatments."
Can't escape the quantum. Looking at eBay, except for 6.3A fast blow, one has to buy directly from Germany, with a proviso about slow shipping, up to 2 months.
It appears actually cheaper to buy from Analogue Seduction in the UK, which carries them for about $55 each shipped to the States (maybe they'll combine shipping for less). However, they describe both versions as 99% pure silver and 1% of gold, with the difference being between unplated caps and copper plated ones. Is that what you're seeing?
Mains products - Mains Connectors, Fuses, Plugs & Sockets - Fuses from Analogue Seduction
www.analogueseduction.net