FIELD: electronics. SUBSTANCE: power supply source of cathode heater of kinescope has secondary A.C. source, A.C. rectifier bridge, heater, limiter of start current, two diodes two capacitors, three resistors, field-effect transistor and optoelectron unit with proper functional couplings which provides for optimum warming time of heater and cathode of kinescope with subsequent connection of it to high-voltage source. EFFECT: enhanced operational reliability. 3 cl, 3 dwg
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