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The CTC5 high voltage is supposed to be 21 kV. The shunt regulator is supposed to be holding the voltage at 21kV so if it is going above 21kV, something is amiss with the regulator circuit.
On the other hand if it is stuck at 18kV and you are sure of your meter calibration, again something appears to have drifted in the regulator circuit. I'd disconnect the 6BK4 plate and the measure the high voltage. If it reaches about 24kV with a brightness turned right down, that would be correct.
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