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When using a silicon replacement for an EHT rectifier be aware that for some parts, the body of the part is too short to prevent arcing across unless it's potted. Heatshrink sleeving can also work, or putting several in series. They're very low cost now so that last apporach isn't as daft as it sounds.
For replacing a failed heater winding on the LOPT (flyback in US parlance) the inner core of some co-ax cable will often work. Ideally solid dielectric, not semi-air spaced.
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