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Check it with the regulator tube out, i dont think this chassis has the safety to protect against that. If it goes up look for bad resistors. Its not a HV shunt, it regulates the HV by clamping the 900volt boost. There is no danger of running the set with it out.
I had one of these that had a bad resistor and was causing the regulator tube to clamp super hard. It melted the regulator tube.
It could also be due to low b+ from bad caps.
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