Old Heathkit GD-1190 metal detector

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Well at long last I can see the operation of this detector. I always wondered about its performance, now I see someone has repaired such a unit and made a video. How very nice of him. Kudos. Maybe this circuit can be made into a discriminating pinpointer, because the discrimination works!
https://www.youtube.com/watch?v=CDov6o-WZOE