Beolab 1 Thump when signal removed

[Michael Walton]

Hi all

I have a problem with a Beolab 1, it emits a ‘thump’ sound when the signal is removed, or when the volume is reduced. This is the speaker as i have changed leads, signal source and sswapped speakers.

I have included an attachment that demostrates the sound emitted.

My thoughts are a cap has gone low ESR internally, but before i pull the amp board and start investigating i wonder if anyone else has experience or suggestions with this?

Many thanks

Michael

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