My very first thought looking at the rear view of the chassis was "Where's the regulator tube?", hoping it wasn't the dreaded pulse-feedback imbroglio. But it looks like it is.
Admiral was not our house brand, and we used to dread having one of those come in. Invariably, the flyback and H output tube were fried.
Upon replacing the fly and doing the required circuit mods, the HO cathode current would sometimes still soar to over
400 ma as the brightness was turned up(!).
When this happened, we had to do some creative stuff to bring the current down to reason. A 'width cap' across the damper* would lower the current while boosting the width. Then drop the HO screen grid voltage a bit to bring the width back in.
All the while, HV regulation had to hold steady thru the full brightness range.
So juggling those values was quite a challenge.
Hopefully your set will not run into this level of difficulty.
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*A disc ceramic of either 68, 82, or 100 pf @6KV, between cathode and plate of the damper