D 150-A turn-on thump

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DGlass    0

If it's both channels making the thump it is more than likely one side of the +/- 10v power supply that is charging/discharging faster than the other.

If it is one side or the other that is thumping than it is more than likely an output device or even a driver transistor getting ready to go bad.

In either case it should go to a qualified service technician to be looked at to properly diagnose the exact component failure.

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