If you're handy with wood, build a small inverted "U" shaped frame and then cover it with metal screening. The screen will allow the heat to rise out of the amp and will deter the cats from climbing on top of the amp. By not having a flat surface, the cats won't try to lay on top of the "U" shaped frame either. You can make the frame out of any type of wood and stain it to match the rest of the decor as desired.
As a side note, cat hair by itself typically won't short out anything. A cat that falls asleep on top of the amp and drools might. Sean
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As a side note, cat hair by itself typically won't short out anything. A cat that falls asleep on top of the amp and drools might. Sean
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