Fuses and confusion

They all have fuses. Changing them does nothing to the warranty. They are usually pretty obvious.  

Three are most common. One is a round knob on the back that says Fuse. These are spring loaded and usually push forward while turning, then pull out. If you don't see that one then look real close at the IEC socket where the power cord plugs in. Hidden very small on these is a little tab that is a pain to get out unless you use something like a small screwdriver to catch the tiny little tab and pull. These holders use a physically smaller size fuse. 

If you can't find either of those then unscrew the cover and have a look inside. The fuse will usually be very near where the AC power comes in. 

Replace your crap factory fuse with Synergistic Orange, it will be like going to a really good power cord. Hard to believe. Direction definitely makes a difference. So if its a remove the cover situation don't screw everything back together until you're sure.

Your amp’s fuse holders have a screwdriver slot, in the cap (if it’s the typical Sunfire Load Invariant).    Do not try to unscrew them.        As MC stated; push in and turn counter-clockwise, 90 degrees.           I’ve had to replace a few fuse holders, for the uninformed.

Replacing a perfectly good fuse with anything claiming to be better is an utter waste of time and money as they will not improve any aspect of a component's performance. "Directionality" in a fuse makes no difference as none of the wires or PC traces in your components are likely to be installed with any regard to directionality. 

Thanks for everyone's help. I was able to poke around and figure out how to get the fuses out and copy down the markings and put them back in without blowing up components or fuse.