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Message: <blockquote data-quote="jeallen01" data-source="post: 1150588" data-attributes="member: 176704">We seem to have been concentrating somewhat on the possibility of there being "something new in the local environment", but here's another thought: What if the EMI suppression on an existing unit has failed?The mate that had had boiler interference later said to me that there had been a "bang" from his amp (and so he switched it off!). When I opened it up, I found that a contact suppression capacitor across the internal mains switch contacts had simply melted (and smoked a bit!) - so I simply snipped the capacitor leads and removed it, and the amp worked fine after that ( and without any reports of a new source of interference in the house!) .</blockquote>