Penta unusual loud noises. Like loud Scratching

[nigel_surtees]

Hi All
I am new to this forum. I have a beocenter 9500 with Penta mk3 active speakers. I have had the system for about 5 years with no problems. About 6 months ago one speaker starting making very loud noises. they are hard to describe so I made a recording and attached it to this thread. Its like static scratching and very loud.

I have replaced all the electrolytic capacitors using a kit bought online. Its made no difference. During the overhaul I replaced the trimmers and set the dc offset which is now practically 0v.
Could it be the big power capacitors?  I didn’t replace these as they were not in the kit.

Any ideas very welcome.

Thanks

[Author]

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