Reply To: Beomaster 4400 – Sudden drop in sound?

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Glad to hear that you are making progress…

Capacitors were all changed into film caps

Does this include 5C15? Did you inadvertently change the timing characteristics of the silent tuning circuit?

The figure showing the relationship between the TP14 signal and the Mute signal could be a clue.


TP14 moving into the range of -2v to -5v would partially enable the mute functionality.

I’m also very curious to hear if this is on just FM or also on the other inputs. I keep an old portable MP3 player on my bench as a source for doing quick tests like this.