Amp Fuse Question

I have a Yamaha M70 Amp. I checked the fuses in this amp and the 2 fuses up front are clear glass with wire however one fuse in the back of amp is glass with white paper inside of it.....instead of the clear glass with wire.
what kind of fuse is this ? Is it correct ?
There is a number stamped on the metal end of the fuse- probably several numbers. That will tell you if its correct. In a solid state amp, the fuse will probably be a 312, which is a fast blow. The current will be the other number, which will be followed by a capital A. The fuse rating is marked on the amp; if the same as what you see then you are good to go.