Question about Monster Cable MPA3250SS 3-Channel Amplifier

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Have a trio of Hafler 9505

Same issue :static on one channel then goes down for the count . All three work same way. Worked great for years, bought new.

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Hi George

Not 100% sure about your exact problem you have asked about. . Is it that all three amps go down simultaneously, or has each amp failed in the same way over time? If all are presenting this problem together then I would suspect a preamp problem, pushing DC voltage to the power amps. If you could please confirm this.

Static sounds are generally created by a failing component, usually a transistor or capacitor going leaky and allowing incorrect DC voltages to pass and upset the operation of the circuit. In turn this is firing the protection circuit, causing the amp goes down for the count. These sorts of problems can some times be easy, and then other times difficult to find. Generally, the best approach to fault finding this sort of problem is with localised alternate heating(hair dryer) and rapid cooling with CRC Freeze Spray. It is the best way to find isolate intermittent parts failing in this manner. Then you know what to replace. If you are not familiar with board level repairs, this may be a job for a HiFi specialist service guy to fix for you. Let me know is you need further assistance. Cheers.


Posted on Oct 13, 2008


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