This almost always indicates a blown speaker. If you have an ohm meter you can use that to test the impedance on your speakers. After disconnecting the speaker - touch the red lead to one connector and the black lead to the other. If it reads something other than 8ohms that speaker is blown.
If you don't have an ohm meter you can simply disconnect one speaker at a time and run that way until the fuse blows. If the fuse never blows then you've found the suspect speaker.
Sometimes blown speaker can hide by stealth. When cold everything is normal. When things start to heat up from use the failed circuit shorts and blows the fuse on your amp.
sorry I didn't notice this. This indicates a short in the amplifier. Best case scenario there is something grounding the positive and negative outputs together. Again the ohmmeter is your friend. Check the impedance between the positive and negative terminal of each output with nothing connected. If your reading is zero you have a hard short. If the reading is not zero - making sense of the data would require professional expertise. If it is zero and you have a hard short- visually inspect the terminals looking for what is causing the short. You might need to remove the cover if there's nothing obvious outside. Most likely the terminals are shorting against the chassis due to faulty assembly or damage. If you are unable to see a simple cause for the short there is probably a failed component inside. Frequently even a novice can identify this type of failure. Look for visibly burned or melted components. If you find something that is most likely the culprit. If you're feeling adventurous try replacing like for like. Some soldering will probably be necessary.
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I have the same problem with my 5 amp/125 watt fuse, and it is not a blown speaker. With nothing connected to the amp, the fuse blows as soon as it is turned on. Please help.
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