Re: A Stereo decoder for Leak Troughline 3
Since there maybe a problem with the decoder, I suggest that that you disconnect it completely for the moment and try to get the tuner back to normal.
Without the decoder you should have something like the attached sketch at the audio out from the tuner. If you then connect this to your amp it should work, but be careful because the output will be a full volume since there is no volume control.
I also noticed something else in the mono version and that is another capacitor C55 which is connected to the cathode of V5B. That too should be disconnected as it may be affecting the 19 KHz pilot as before.
Let us know what happens.
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