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If your HV transformer looks OK it probably is, the 1B3 doesn't light enough to easily see
I'd look for a problem in the Horiz Oscillator circuit, check the voltages on that tube and if it hasn't been recapped in that area that would be a good place to start.
Does the set have sound? If it's totally dead it might be a problem with the low voltage supply.
I hate to say it but often times problems are caused by someone mis-wiring a cap when they recap.
Do you have a schematic for the set?
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