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If the CRT lost vacuum (went to air), the heater would not be glowing a normal healthy orange which it appears to be doing. Instead, the CRT neck would become sizzling hot very quickly because the heater is immersed in heat-conductive fluid (air), and will not be glowing visibly.
Also if it lost vacuum, it would lug the HV down and you wouldn't have got that unnerving ZZap.
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