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without a full schematic its hard to say if a defect in the 125v supply from the stacked b+ was used somewhere in the horz sweep circuit.
So you replaced the 68 ohm resistor in the cathode circuit of the audio out and all the voltage are reading correct for the audio out tube now?
Loss of HV generally starts with subbing new tube, horz osc, horz out, damper, and HV rectifier, and if used HV regulator.
I prefer tube subbing over tube testers, esp in sweep circuits.
I generally will uses a my BK 1076 analyst next to start with a plate drive signal to clear the damper/yoke/fly, if that works then I move to the grid drive signal, that will check the horz out tube, if that works then move on to the horz osc tube and check for voltages at the plate and screens.
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