Aftermarket fuse to tame a bright system?

This is why, over time, I’ve gravitated to using the Cable Company’s lending library.

The cables are already run in. Also, I’ve learned to never make a cable buying decision without comparing at least three different cables. My last cable purchase was a digital cable and I tried 6 different cables before making a final decision.

As for silver, I’ve had silver cables that sounded just right with one set of components and too bright (or too dull ) with different sets of components.

@bolong

I tried several tubes in my LTA MicroZOTL preamp.  Telefunken, Siemens, Brimar Yellow T, Philips, etc. The Telefunken are the more detailed/bright of the bunch, but they sound the best in my opinion.  They didn't play well with silver cables.  I ended up not using any of them. 

That cable company lending library is a great idea - shame I’m not in the USA.

Silver like my 8AG speakers cable is spectacular on the right set up.Cables need to settle and broken in. Be patience.

I'd say it is possible.  "Too Bright" really means too much treble compared to the bass and midrange.   the added resistance of a fuse will affect bass and dynamics most since they pull the most current (a fuse has to have resistance or it wouldn't heat up and blow, physics).  So fixing the fuse problem will give better balance to the highs.

I'd try a slug first since that is very cheap and represents the most improvement you can get.  Your upgraded fuse will not give as much improvement as the slug will.   Some power supplies are unaffected by the fuse, others are affected and you might be surprised which ones are which. 

Of course you won't have fuse protection for the minutes or hours it takes you to do this test. Don't do it during a thunderstorm.

Jerry