I recently bought an Acurus A250 amplifier. The seller disclosed that the one channel had an issue with intermittent loud static on the right hand channel. What he did not disclosed was that extensive work has been done to try to cure the problem with no success. I can see that the output transistors on the faulty channel were replaced, all the solder joins were reflowed and the psu caps were replaced. The boards are simple enough that I could swop out all the components until the problem disappears but I am hoping that one of the amplifiers gurus on Diyaudio could assist to point out components that I should try first. Any help assistance would be gratefully accpeted.
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A cold spray and an insulated prodding stick can help identify dodgy components that are thermally or mechanically "sensitive".... It probably one component or connection and a bit of carefully prodding and chilling may identify which relatively painlessly - hairline cracks on pcbs are a possible cause too.