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Hi Timmy,
Do you have an oscilloscope ? If you do check for the waveform at the grid of the vertical output portion of the 12bh7. If you do then your blocking transformer should be O.K. If there is a correct waveform at the grid then check for a wave form at the plate of the 12bh7 vertical output. If you get a wave form , then disconnect one of the leads from the vertical deflection coil. then test for a waveform on the secondary of the vertical output transformer. If you do get a waveform then you may have a problem with the yoke.
Ed
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