Its an PA amplifier and i think this is build with an integrated powerpack IC output stage,
There are different TOA amps but if this model look first the fuses if that are (important)measured defect give a new fuse a try if it blows again there is something wrong in the cables or a speaker conection or filter , ut if the fuses are good there could be an single great brown or black colored IC with STK (....)A or B or something similar is to read on it on the great heatsink inside the amplifier that could be having 15 or more legs must be replaced , BUT also some capacitors thats belong to the output stage because every defect is having a cause.
It think this amplifier IC should similar be looking like this
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