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I am presently working on a Sears 12" color hybrid set from 1971. This set was made in Japan. On it, the high voltage regulation is accomplished by regulating the screen grid supply to the horizontal output tube. 1/2 of an 8FQ7 is used. I had not seen a design like this before.
After replacing a defective 1 meg resistor, the circuit is working, but some blooming is occurring on bright pictures. The high voltage at minimum brightness is within the Sams listed specification.
I plan to replace the 3AT2 high voltage rectifier to see if this reduces the blooming.
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