. The Bell System technical journal . -3Z -30 -Z& -26 -24 -22 -20 -18 -Ifc -14 -12V0LT5GRID POTENTIAL Fig. 7—EL tube No. 109,150. External resistance = 15,000 = amperes plate potential. This depends evidently upon the desired results in an illustrative case are depicted by Fig. 9, whichrepresents the level of second harmonic current referred to the funda-mental current (A) plotted as a function of the external plate the point of minimum distortion—in which the second harmonic Ep = IJO VOLTS Ep=l40C-£p = lfcOd-Ep = 200e-Ep-240. -32 -30 -28 -2fe -24 -22 -20 -1
. The Bell System technical journal . -3Z -30 -Z& -26 -24 -22 -20 -18 -Ifc -14 -12V0LT5GRID POTENTIAL Fig. 7—EL tube No. 109,150. External resistance = 15,000 = amperes plate potential. This depends evidently upon the desired results in an illustrative case are depicted by Fig. 9, whichrepresents the level of second harmonic current referred to the funda-mental current (A) plotted as a function of the external plate the point of minimum distortion—in which the second harmonic Ep = IJO VOLTS Ep=l40C-£p = lfcOd-Ep = 200e-Ep-240. -32 -30 -28 -2fe -24 -22 -20 -18 -16 -14 -12 -10 -8 -fe -4V0LT5 GRID POTENTIAL Fig. 8—EL tube No. 109,150. External resistance = 30,000 = amperes MODULATION IN VACUUM TUBES 457 level is down on the fundamental—the external resistance istwice the internal, the grid potential is — 10, and the improvement inthe relative reduction of Ji over customary conditions (for whichR = Rq and Ec = — 9) is about A similar survey made Z^^KKi? o25 /■ ^ \ • 1 y .A \ / ^y^ \ / •^ E^ \ /, ,,- - \ 1 ■^ ^^ 1 • / ^ \ / ^ OPTIMUM CONDITIO^Be-E,=IOVOLT5K = IZ,500OHM5A= y / SI II O O 5,000 10,000 15,000 Z5,0OO 0HM5 EXTERNAL RESISTANCE Fig. 9—Ratio of second harmonic to fundamental as a function of load tube No. 109,150. Ep = 120, e = — Ec (variable). Power output constant= .056 watt, with regard to the maximum fundamental power obtainable withconstant plate potential, and with plate resista
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
