Fuse replacement

@richardbrand ...The easiest way to increase the resistance is to make the cross-section smaller.

Agreed as well but that is mainly for fast blow fuse(s).  Most of high-end gears that use transformer like toroidal uses slow blow fuse(s) (T- like you can see above) to avoid fuse(s) blown out prematurely due to high inrush current or temp start-up spikes.  For slow-blow fuses, thicker element is often used or changing the straight geometry to coiled one.  Fills like quartz sand and / or copper power are often used to dissipate / absorb heats (although that is the only / main purpose).  

@lanx0003 

Sorry, from your photo, the fuses looked as if they just contained a piece of straight wire.

Was it Wile E. Coyote that turned you on to Acme fuses?

@larryi  Ha! Good one.  I like the joke but I was not convinced with CFC (Crystal Fiber Compound) coating on Acme fuses.  

@richardbrand  The pair on my Denafrips Hestia are low-cost slow-blow fuses that use thicker element but the higher cost alternative may use coiled element as shown in Figure 2 in the following article

https://www.ariat-tech.com/blog/understanding-slow-blow-vs.fast-blow-fuses.html

Fuses are simple devices that do absolutely nothing to the signal. Period.