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I read somewhere that the inverted guns had to do with pincushion-I think that was it? On a smaller screen (mostly, smaller than this) they could get away without a correction circuit but it worked better if the blue was on bottom.
I have one or two junker CTC-53's, but shipping wouldn't be much fun. I'm guessing the focus doesn't draw much current. I have found some old (and small) bias supplies that were cheap. Maybe one could be wired in. I've never fooled with a focus divider but that seems like a reasonable way to go.
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Bryan
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