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I had the same issue on my CTC5. I checked everything and determined that the supply did not push out enough HV to allow the shunt regulator to work effectively.
The solution I had was to substitute a solid state replacement for the 3A3 rectifier. After the replacemement my set maintained a solid 21kV.
Never investigated if it was because the filament supply of thge 3A3 was insufficient.
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