clock radio problem

clock radio with slow "put put put" motorboat sound in speakers with radio OFF. no visual indication of bad components or bad solder joints. have replaced two electrolytics nearest power transformer but without a schematic and voltages at checkpoints, still no success. any help? it's an emerson CK5235.

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Check the pass element that powers the radio when you select 'radio' as the alarm. Sounds leaky.


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Corrossion in the waveband switch or another switch

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