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If the Beam Current Limiter isnt working--or mis-adjusted, that would upset the EHT Regulation....
The (assume shunt-reg) can only regulate so far, and if the beam-current goes above a certain level, the regulator will be effectively cut off completely and no regulation can occur. The EHT will then be lower than it should be, and ballooning pictures/de-focussing will happen....
I would recommend you set up the drives, grey-scale, any extra screen or drive adjustments or voltages, the BCL and the EHT Regulator to the service-manual settings, then try again....
--If no good, doing the set-up procedure should indicate where the fault lies, maybe check the shunt reg, the EHT Rectifier and the Flyback Overwind for problems
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