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If you can get a good black & white picture by adjusting the blue and green screen and background controls I wouldn't worry to much. The procedure in the field service guide calls for the red control to be 1/4 turn up from ninimum anyway. Then you use the red and green screen controls to get a good b&w picture through the brightness range without blooming. Remember red was one of the least efficient phosphors used. The red control is not to be changed from it's initial setting. On later sets they added a Kine bias control that you would trun down until the dominant color just dissipeared. If red is indeed to high to get a good gray scale, you could check the resistors in the crt bias ciriuits. It is possible you may have a resistor that has drifted off value.
Bill R
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