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You should see a square wave on the transformer winding. You do have an oscilloscope, right? If not, get one.
It appears to use a self rectifying vibrator. They have a lot of contacts, any of which could not be operating. It also appears that two different vibrators may have been used. There is no indication of vibrator type on the diagram.
In a set that old, the buffer capacitor (the one across the secondary of the transformer) may be bad, which places a lot of stress on the contacts. That's the first thing to replace, along with the filter capacitors.
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