. A system of multiplex telephony by the use of vacuum tubes . V ^KsrsrF^pr^/ry/^r^ir/vsiTA^^iTTO—sui/^o. 19 amperes and the plate voltage 30. If now the gridpotential is increased negatively, a point isreached where the plate current is entirely arr-ested. In other words, the grid now has a suffic-ient negative charge to repell all of the elect-rons emitted by the filament and hence none ispresent between grid and plate and therefore nocurrent can flow. The amplification constant for this tube maybe obtained from the curve. To produce a change of3 miilliamperes the change in plate voltage is
. A system of multiplex telephony by the use of vacuum tubes . V ^KsrsrF^pr^/ry/^r^ir/vsiTA^^iTTO—sui/^o. 19 amperes and the plate voltage 30. If now the gridpotential is increased negatively, a point isreached where the plate current is entirely arr-ested. In other words, the grid now has a suffic-ient negative charge to repell all of the elect-rons emitted by the filament and hence none ispresent between grid and plate and therefore nocurrent can flow. The amplification constant for this tube maybe obtained from the curve. To produce a change of3 miilliamperes the change in plate voltage is from62 to 92, or 30 volts. To produce the same changeby grid potential requires a change from i volt volts, a change of volts. Then u = 30 The power amplification must of course in-clude the current relations, and since the gridcurrent is very small, this constant approaches200. In we show similiar curves to the abovefor the VT_2, and again the specified values setdown by the designers give the best working curve,which approaches a straight line.
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Keywords: ., bookcentury1900, bookdecade1910, bookidsystemofmult, bookyear1919
