. The Bell System technical journal . (a) SERIES MODULATOR CIRCUIT CURRENT-LIMITING IMPEDANCE STORAGE ^±jO ^^b MODULATOR CAPACITOR 03^,,,^,^,. (b) SHUNT- MODULATOR CIRCUITFig. 2—Typical pulse modulator circuits. of conserving control power it is desirable to build high perveance tubeswhich require very close control-grid to cathode spacings. This is muchmore easily accomplished with rigid cathode structures rather than fila-mentary cathodes, especially for service conditions under which extremeshock and vibration may be encountered. Conservation of drive power requires that the modulator tube
. The Bell System technical journal . (a) SERIES MODULATOR CIRCUIT CURRENT-LIMITING IMPEDANCE STORAGE ^±jO ^^b MODULATOR CAPACITOR 03^,,,^,^,. (b) SHUNT- MODULATOR CIRCUITFig. 2—Typical pulse modulator circuits. of conserving control power it is desirable to build high perveance tubeswhich require very close control-grid to cathode spacings. This is muchmore easily accomplished with rigid cathode structures rather than fila-mentary cathodes, especially for service conditions under which extremeshock and vibration may be encountered. Conservation of drive power requires that the modulator tube have highpower-gain. This is most easily provided in the tetrode which provides ahigh over-all amplification factor with reasonable drive up the control-grid and screen-grid wires is of course advantageousin the interest of minimizing screen dissipation and getting the largestpossible jiortion of the cathode current to the plate. The control-grid to PULSE MODULATOR TUBES 821 plate capacitance is of little importance as long as it does not store muchenergy, there being little chance for oscillation in such a circ
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
