A voltage of 6 V and a current of 0.3 A are required for the normal filament supply of a radio tube. Draw a diagram of a transformless filament supply of an eight-tube receiver from 220 V mains. Compare the heat dissipated per second by the tubes and by the instrument series resistor.

A voltage of 6 V and a current of 0.3 A are required for the normal fi

1.	A voltage of 6 V and a current of 0.3 A are required for the normal filament supply of a radio tube. Draw a diagram of a transformless filament supply of an eight-tube receiver from 220 V mains. Compare the heat dissipated per second by the tubes and by the instrument series resistor.
Answer» Solution :Connect all the TUBES in sers (Fig. 26.14) TOGETHER with a series resistor `R=(U-n triangle Psi)//i="573 OHM"`. The power dissipated is P=iU=66W. The ratio of the power dissipated in the tubes to that in the series resistor is `(n triangle Q)/(U-n triangle Q)`

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A voltage of 6 V and a current of 0.3 A are required for the normal filament supply of a radio tube. Draw a diagram of a transformless filament supply of an eight-tube receiver from 220 V mains. Compare the heat dissipated per second by the tubes and by the instrument series resistor.

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