The receiver uses three radio tubes, L1, L2 and L3, with a filament voltage of V = 6 V and a filament current of 0.1, 0.2, 0.3 A, respectively. Draw diagrams of transformerless power supply of an incandescent circuit from a network with a voltage of V0 = 120 V in the case of series and parallel connection of lamps. Determine the value of additional resistance at which the lamps in both cases will operate in the given modes.

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