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Milk white getter means the tube has lost it's vacuum. What I see would indicate that the tube is either beginning to take on gas, or has been ran long and or hard enough to wear out the getther. I'd get a replacement for that tube or at least test it.
HO Tube redplating will quickly kill the HO tube. The horizontal appeared to be on frequency in the pictures you posted. If it is like the American Synchroguide horizontal oscillator circuit then it can be on frequency and still miss-adjusted....There is a certain waveform in the oscillator that is supposed to be tweaked such that the point is at the same height as the hump on the other side of the valley between them when viewed on an oscilloscope.
Has the horizontal section been recapped recently with good parts? What are the cathode, grid and screen voltages on the H output tube, and what does the service literature on it say it should be?
I'm no expert on rewinding, but I'll say this: They chose the thickness and turns ratio of the windings for a reason and changing that without understanding of the design process, unless you absolutely could not obtain the same type of wire, is a risky move. On things like that it is best do it right the first time.
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