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More information would be helpful.
Is there any light on the screen at all?
If so, is the picture full width?
Is the picture trapazoid or a rectangle?
Is there any high voltage or damper cathode voltage at all if you remove the damper tube?
Have you replaced tubes including the 6BG6, damper tube and 1B3?
What is the 6BG6 screen voltage?
What is the 6BG6 control grid voltage?
Does the AC arc on the top of the 1B3 increase with the tube out?
Some answers will help us be more especific.
Good luck,
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