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In every case I have seen there wont be enough voltage to heat the hv rectifier filament long before you loose deflection. (no hv) I would look at the yoke area.
The osc should run close to the right frequency without the feedback. If the fly had shorted turns I dont think you would get any hv.
One other thing that comes to mine is those domino style capacitors. I have seen so many of those fail a week or two after getting an old set working.
Can you post a schematic of the area?
I was just looking at an article in a 50s tv repair mag talking about this deflection. I will try and find it.
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