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This was a recommended change, and when I tried it, it really helped. The original circuit makes the brightness vary with the contrast setting because it varies the DC in the video output stage. If you find my posting in "I've been blessed" you will see that my only mistake was wiring the contrast control backwards when I modified it. Otherwise, it is much better than the original circuit, as reported above. I had no problem getting cutoff, so I'd guess you have a problem somewhere with bad R values.
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