Bill (Grannyring), as you realize a given length of 14 gauge wire will have much lower resistance than the same length of thin fuse wire. However, the very short length of a fuse wire will result in very low resistance anyway, since the resistance of a conductor is directly proportional to length (as are inductance, capacitance, and many other wire and cable parameters and effects). Consequently the voltage drop across a fuse in an audio component will be a small fraction of a volt, and in many cases a very small fraction of a volt. That can be confirmed via some simple calculations based on the detailed technical specs that are provided for Littelfuse and Bussmann fuses.
It would seem expectable that there will be **some** circumstances under which loss of a small fraction of a volt in a fuse would have audible consequences, although not necessarily in the direction of causing the sonics to be worse. However, as I’ve previously said in this thread what seems unexplainable is that upgrading to a specific fuse would be found to be sonically beneficial with the high degree of consistency that has been reported, among components that are completely different in design, that perform completely different functions, that are used in very different systems, that are powered by AC having very different voltage and noise characteristics, and in DC as well as AC applications. That continues to be a mystery as far as I am concerned.
Best regards,
-- Al