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That second circuit up there ^ is basically what I did on my 20B1. I understand why you need a positive pulse if you connect to the CRT grid, and negative pulse on the cathode. But I notice that on the first page of that book posted, it says also to connect to whichever (grid or cathode) the video does not. I think I've had it work both ways (connected to the same place as the video, or the brightness control), so what is the reason for this?
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