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I hooked it up to a test pattern, and an oscilloscope. The brightness and contrast controls do their thing - the brightness shifts the video signal up and down, and the contrast controls its dynamic range. The amplitude is in all cases way too small, it is about a 70V peak to peak signal with brightness and contrast all the way up, with 175VDC on the cathodes. Changing the kine bias and screen controls does affect brightness, but I think the video signal is just too weak to turn the CRT on completely.
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