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If the CRT is still good, recap it, replace the likely bad selenium rectifiers, adding an appropriate B plus dropping resistor, and you'll have a good performer. But be careful as it has a hot chassis.(no power transformer). The capacitors are in close quarters on those phenolic boards , so work carefully.
I worked on lots of this and their variations - a long time ago. Only once did I find a defective component- a deflection yoke with a shorted horizontal turn.
Bob Hodge
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