The most unreliable node of a lamp TV is a lowercase sweep. Often flew lowercase transformers in schemes with high-voltage kenotron, since the high-voltage winding contained a large number of turns and had to give a full sweep of rectified voltage. Insulation requirements are particularly stringent. Given the Soviet quality, they often did not stand up and broke through. Sometimes they broke through metal capacitors. Only in ULCTI for the first time began to put high-voltage multipliers and thus partially unloaded the transformer. In televisions of recent generations, a diode-cascade lowercase transformer was used, which did not require either a multiplier or persistent interturn insulation, and the capacity of the high-voltage winding was already minimal. Also, expensive high-voltage diode poles were not required.
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