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Hmmm. Did the set work correctly at one point, or has it always been thus? (Wondering if it's a failure, or some other influence) I'd take a hard look at C131, the 1uF in the cathode circuit. You're dealing with a pretty hefty pulse current here, and an aluminum electrolytic may have a high enough ESR to not work very well.. The sch seems to indicate it's not an electrolytic. Also R20 and R156 100 Ohm and 180 Ohm basically in parallel, (hard to keep jumping from one page to another) Scoping the -130V line may tell something too.
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