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I would not consider your B+ low. Figure those stated voltages are +/- 20% or more. Plus you haven't recapped the whole set yet. Some circuits could be drawing more power than typical.
Measure the voltages on the 6BG6 and check the grid drive waveform. Likely your hor. freq. is off.
I wouldn't expect you to get full HV until the whole hor. oscillator and output circuit is gone over.
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