NAD 3140 Stereo Integrated Amplifier Black 2-Channel 300W Soft Clipping

Note: Amp is fully operational and sounds kickass, but it does have a low hum that is noticeable at low volumes, not noticeable at mid to higher volumes. The amp also makes a booming sound when you power it off. I replaced the 4 main capacitors in an attempt to fix this but the issue persists.

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