Discussion in 'Hi-Fi Stereo Systems & Separates' started by cs2005, Mar 27, 2006.
A full EMC compliance test and report should be about £5k or thereabouts. You may even be exempt from some testing because the amp doesn't contain any clocks or high frequency circuits, in which case that'll save some cost too. Conducted emissions is the area you might have a problem, make sure you design the power supply with this in mind, and add more filtering than you think you need. I've seen linear power supplies fail this test badly, never mind switched mode.
ESD immunity might be an issue too, depending on how exposed your valves are - you don't want the ESD gun to be able to get anywhere where the discharge might reach the solid state electronics, even if the tubes themselves are immune to damage from it.
It's safety testing (Low Voltage Directive) that you also need to bear in mind - the chances of you actually getting sued for producing a product that catches fire or electrocutes someone are much greater than the chance that someone will pick up on a bad radio interference problem IMHO.
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