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The frequency and amplitude and shape of the signal has to be right. Example, if the sign-wave at pin 2 of V12 is wrong, then the signal at pin 5 of the horizontal output tubes will not be correct, also, if that signal is not aprox 150v p-p, HV & sweep could be low.
Also, if the signals in/out of V12 are nor right, there could be a problem with synchronization.
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