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With the chassis out, you don't need the CRT hooked up for troubleshooting this particular problem. It's not going to make HV anyway with those tubes removed.
If you've got an analog milliameter with a 0-500 ma (or 0-250 ma) range, just stick it in series with R127B, variac the chassis up to normal line voltage, and see what the current thru R127B is.
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