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You'll probably have more correct boost and HV when you get the horizontal frequency on spec. I haven't seen the h osc circuit schematic of one of those in years, but the osc is probably adjusted with a slug tuned coil or possibly a trimmer cap...Dirty secret of most TVs with a hold pot: the pot is the fine frequency and often varies the effect of the AFC tube that pulls the frequency of the oscillator...The course hold is usually slug(s) in the H osc transformer (some sets especially Zenith and portables did away with the pot and made the transformer slug the user control).
On some sets, the boost also feeds the vertical osc/output, and powers other stages...If the vert stage is defective in such a way that it is loading down the boost rail it could be causing the H osc to not get enough boost to run on frequency...May want to prioritize vertical and troubleshooting of boost powered stages first.
BTW may want to pull the photomultiplier tube if you are operating with the lid removed and fluorescent shop lighting. The flying spot CRT produces ultraviolet light as does some non-incandescent lighting (especially fluorescent) and if you overload the photomultiplier with more ultraviolet light than the CRT makes you could damage it.
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