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I don't recall there being a standard value for HO tube cathode current in most monochrome sets, but as a general rule if the flyback is cool after 45min+ of operation you are probably okay. Most sets fused that circuit at 250mA but ran it at around half that. As a general rule the lowest value one can get the current and still retain acceptable preformance is generally the best value for the longevity of the circuits.
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