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Mine had a crt that was weak, still displayed ok. On mine the doubler caps were bad (at least one was) other than that you just have to make sure the PCB grounds are good (they rely on screws that just hold the board into contact with the chassis. So if you get a slow hula, check there 1st. cleaning up the contact point would prob be enough, I used some solder braid to make a GOOD ground. Mine had the issue on the deflection pcb.
there are taps that sensor goes to to select how effective it is, so if its too dark in a darkedn room you can try a different tap.
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