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One thing that's worth doing both for blooming and improved HV is to convert it to the CTC-7 HV regulator circuit. The only difference is one of the CTC-5 fixed resistors was replaced with a pot and a fixed resistor on the CTC-7. This allows you to adjust the HV regulator as all previous and subsequent RCA color sets did. Setting it so it just starts to limit at the max HV spec on the schematic is usually a noticeable improvement over what fixed resistors and whatever emissions of the tube has presently arbitrarily achieve.
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