Technics SU-8099 fuse question

Hi,

I opened up my Technics SU-8099 for the first time to clean the pots. When I was taking pictures of it, I noticed a fuse somewhere in the back (250 V - F7 T 800mA), which doesn't
seem to have a wire in it ?
Do there exist fuses which do not have a metal wire in them ?
The amplifier works perfect (and is also in near perfect optical condition :), so it seems impossible that the fuse is blown...
but then why isn't there a wire to be seen ?

Thanks,

Z.
 

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