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Recent repair blog

Bad hum on a bass amp – Dry joints and storage capacitors

dry solder joint on PCB bass amplifier

An Ashdown MAG 300 amplifier with a reported loud intermittent hum fault on the speaker regardless of volume control.  Initially the first point of call is to measure the speaker terminals for any DC appearing on the output.  Any significant DC on the speaker output will generally make a hum.  […]

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