Re: A Stereo decoder for Leak Troughline 3
Temporarily put the decoder on one side. First you have to get audio out of the tuner again. The output, from the cathode circuit of V5b, will lack deemphasis (so will sound shrill) but should otherwise be OK. Get this working first. You should not have changed much in the tuner, and you should be able to temporarily undo the changes. Ensure you have identified the right components/wiring to change.
The decoder LED is probably just flickering due to noise. Sometimes the noise will happen to look a bit like a 19kHz pilot tone for a brief time.
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