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looking for a circuit diagram for a sub woofer amp

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Hi, Im trying to find a circuit diagram for my sub woofer amplifier. It is the same as the one in this thread: (but without the mods)  It is made by Acoustics Technology England with the model number "150 W Active Subwoofer"  it is more than ten years old, I think I bought it in 2008, it was working until last week, I am pretty sure the fault lies in the power supply because it turns on, gives normal sound for a second then slowly fades out, Turn it off andback on again and it repeats the fault



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