Overall, other than the linearity and the blueish screen, you've got a winner there.
When I used to set up the screen controls with the service switch, I'd bring up red first to be almost dim... I did mine in a darkened room... Then the blue to make the red line purple, and then the green to make the grey. That should get you close.
Forgot to say, turn the color and brightness all the way down first.
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Bruce
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