I called Mesa and the gentlemen told me the fuse I need is written on the head, fair enough. It says 6.25A slo blo. I have gone to three hardware stores and cannot find this fuse. I did a search on TB, and a lot of the guys have noted that they use 8A slo blo fuses for their 400+, and the 6.25 is for 400's. Mine has 12 power amp tubes, and 4 preamp tubes, so I am quite sure it is a 400+. What should I do? Any suggestion where I can find a 6.25 if that is in fact the correct fuse? Appreciate the help, internet searching is not coming up for much for me.