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Grundig rf 511 sound goes away after 5 seconds

When the radio first starts, there is sound, but it goes away after 5 seconds. What could be the reason for the problem?

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torokj
torokj picture

Hello ,
I would check  the old germanium transistors of the output stage (AC 187-188,Diode 13),and the output voltage of power the supply .
Schema
 

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