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Like jr said, you have a vertical problem. That 6BQ6 you replaced was the horizontal output, and by the look of it that one swap gave you some decent HV! Wish it would have been that simple on mine. Check the vertical circuit tubes, make sure they are good. If they are, start replacing bad capacitors. My set mad a whole slew of bad molded caps, even micas that supposedly don't go bad. If that's not it, the yoke or vertical output transformer may be bad.
jr: I had a bad 7N7 in my set as well, one of the triodes was dead even though the filament still glowed. If you don't like searching for those loctal tubes, you can do like I did and swap to the octal (and much easier to find) 6SN7. They are identical electrically.
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