Audio Grade Fuse, Anyone?

20MM is that 3 quarters of an inch?I just measured the one visable fuse in my Marantz DV8300 2AMP/125 volt.Also the directional thing is puzzling because the fuse is mounted sideways (not pointing towards the front or rear of the unit)

I think it is about 3/4 inch. The direction is from the ac IEC connector toward the power supply. With the unit not plugged in use a meter to find which side of the open fuse holder shows conductivity to the IEC. The other end must be to the power supply. Run the arrow from the ac to the power supply.

I don't have a meter-I guess I can get one.But on my board the transformer and wiring is on the right.Below the fuse currently in place there is writing:Jp 03 on the right,Jp 04 on the left so I would think direction of the fuse should be pointed going right to left-do you think this is correct?

I didn't realise that Alternating Current travelled in only one direction! Kind of makes the direction of the fuse very important, if that is the case!

Dusted, I also thought the wiring in my Exemplar 3910 was obvious as the ac came into the board beside one of the snap-ins of the fuse holder. My meter proved this to be wrong. Meters are cheap at Radio Shack. Make sure the unit is unplugged and the fuse removed before testing.