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Could be. If the osc trans is set far enough off freq it can kill oscillation.
Remove your H output tube till the osc is working, pull the chassis, get an oscilloscope, and get the osc making on frequency correct looking waveform.
You can verify frequency by feeding your scope composite video, getting 1-3 cycles of video denoted by H sync pulses on scope screen, count the scale divisions between leading edges of the synch pulses, do NOT touch the scope horizontal time scale till your done adjusting the osc, now connect the scope to the H osc and adjust it to make a waveform the same number of divisions between peaks as the sync...If that gets you good osc signal populate the output tube, and if you then have raster run through the sam's horizontal setup procedure.
If the osc won't run start changing resistors (I assume you've already dealt with caps) and checking voltages.
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