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Do you know for sure that the tripler is bad? If you feel static on the screen when you turn on the set; then, you are getting HV and the tripler is likely OK. If no HV is at the CRT; then, unsolder the input lead to the tripler and if there is HV coming out of the flyback, the tripler is bad. If you have no HV coming out of the flyback, you have a problem in either the horizontal output, horizontal driver, or horizontal oscillator stages.
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