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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?

Comments
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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ömer sevingen
ömer sevingen picture

I checked (AC 187-188,Diode 13). but there is no problem. There is only no sound in the FM section and the frequency cannot be found. What could be the problem with the FM floor? Thank you

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