[morzh]

I realized I missed a tubular cap. I thought it was only backelite blocks.
Then I traced the ceramic 0.05uF caps and saw that a couple of more tubulars are supposed to be there; good thing I keep old caps, a bagful, so I restuffed a couple and put them in.

Now, while tracing them, I realized that the volume pot was miswired.
Someone put the detector output, that should go to the top pin of the volume pot, to the wiper pin, and the output circuit that should've gone to the wiper pin - to the top one.

Keep nibbling at it.....