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Message: <blockquote data-quote="Rsim" data-source="post: 1148228" data-attributes="member: 22683"><p>Strange frequency coming out of the speakers - that's a very good clue. So I want to respond to that specifically. One possibility is a drying out electrolytic capacitor. Especially on the powersupply. A technician shop ought to be able to measure-test all the electrolytic capacitors, it does not depend on having schematics. Or, if you feel like doing so, you can instruct a repair shop to replace all electrolytic capacitors (which is a gamble but  cheaper than sending it to England)</p></blockquote><p></p>