Verified answer

If a fuse has blown there must off been something to cause it. Simply replacing the fuse without finding cause is no good. Some amps are very sensitive so it could be something as small as crossed speaker cables. Also if the amp or anything plugged into it isn't earthed correctly this can make the same happen. Ive been into many homes to resolve amp problems and around 60% have had live casing due to insufficent earthing. Sadly if you cant find the problem on the exterior it will need to go to a shop..

I assume it is a power fuse and not a speaker fuse. They don't use speaker fuses any more.

sometimes fuses do just give up. The key is being able to tell by looking if they blew from a short ( they will show signs of blackening) or just from a small overload or because they are old (the element is just open with no blackening.)

If it is blackened don't replace it - there is a problem.

since yours blew again, I bet it is black.

shorted speakers may cause the problem in cheap amps. better amps are protected from that.

blown output transistors will cause that, as will blown components in the power supply.

If it is old it may need wholesale capacitor replacement.

If there is nothing wrong with your speaker cables, i.e shorting, then most likey it's an internal problem.

Not much i can advise you on because it will need to go for repair.

You may get an idea of the problem if you know which fuse has blown. If it is located near to the power input, you may have a power supply problem.

Otherwise, i strongly suspect the o/p transistors or modules.

the right thank you to bridge a 2 channel amp is by combining 2 channels to make one. your amps terminals could be marked as which of them to apply for bridging. and verify whilst bridging a 2 channel amp to no longer pass under 4 ohms or that's going to deliver the amp into secure practices mode

Look for a possible short circuit on the output.