I am thinking that the direction should be the lettering left to right with the beginning of the lettering facing out of the amp and the end of the lettering facing into the amp. Does this sound right?
Not unless the fuses are in a DC circuit, and somehow have better conductivity in one direction rather than the other!
What people hear when they swap fuse direction isn't the fuse having 'directional' properties! Its a combination of the fit of the fuse in its holder (resulting in a lower voltage drop across the fuseholder) and expectation bias. The former is measurable (and slight), the latter is not.
It is impossible for a fuse to have a directional property in an AC circuit! That would cause it to favor one half of the AC power waveform and not the other- this would cause the fuse to heat up, since in the non-favored direction its resistance would be higher. Ohm's Law dictates this.
This would cause the fuse to heat up and fail, possibly within seconds of operation.
This statement is false:
Why a little wire makes such a dramatic difference I don’t know but it does. It has been proven by people’s experience. There are those who feel power products like cables and connectors don’t make a difference but they do. Not always positive I admit as everything is system dependent.
You can measure voltage drops across power cords and that can affect power amps that draw a lot of current (IOW they obey Ohm's Law). But its quite incorrect to say that this aspect of fuses is 'proven'. Its clearly not; I explained why. Further, I presented the explanation of why its actually impossible.
There are a lot of myths in audio, for example the idea that a certain speaker or amplifier can sound favor a certain genre of music. These myths exist in a viral form and infect in a way not unlike actual viruses. Once you disabuse yourself of them, you'll find that you can make greater progress on the sound of your system.
