Where has been your most effective placement for an aftermarket fuse?


Not looking for a debate with anybody on whether aftermarket fuses work or not, this thread is for those fortunate members with the hearing to know that they do indeed work.
I am very interested in your thoughts and opinions as to where they work the best, the biggest bang for your buck if you like.
For myself I am going to say it is in my Metrum Onyx DAC.
And not just my present DAC, all of my last 3 DAC,s showed a very nice easily audible improvement with an aftermarket fuse.
Next I would say is in my Gold Note phono stage and lastly in my BAT integrated amp.

So what or where would you say has been the most noticeable piece of equipment that has benefited from a fuse change in your system?
128x128uberwaltz
Sweet SGordon.
I had one of those Black Ice Sound Expander units and thought it was great for the price.
I rolled a few tubes in it to boot.
But then change of configuration meant it was surplus.
I assume from your statement that it utilised an internal fuse soldered in place which was what they replaced.
Post removed 
I must admit there are a few things I have done regarding audio besides just fuses that have made a clearly audible change without an easily explained rationale.

Tell me about it.
@testpilot 
This is getting close, since I never, for the last 15 years, had the need for any equipment fuses, aftermarket or otherwise. 
Must be ever so 🍀? 

My PassLabs power-amp uses a circuit breaker, and all my other equipment uses some electronic means of protection... at least that's my best guess. 🤔 😉 
M. 🇿🇦