Do so @ your own peril. Not a good idea to up fuse raings in electronics.
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You can order those size fuses from most all the big electronic parts stores or maybe even you local electronic parts store or even Radio Shack. If it was a slow blow .5A you can use a 1A fast blow, but it is better to stay within the design. I have tried the HiFi Tuning Line fuses (very expensive for a fuse) and did not notice any change in sound. Might have been one but it is too small to tell for me.
Sorry - I lost track of your original issue. HiFi Tuning Fuses from the Cable Company might be an option. They appear to have an 0.5 amp option in 2 different size fuses. I used a Radio Shack fuse temporarily and then switched to one of these for my power amp. I thought I heard an improvement in sound.
See the link below. Click on the order form and scroll way down to see the list of amp ratings & sizes etc.