. The Bell System technical journal . Fig. 10—The experimental 426X() vacuum tube. The 5D21 tube also found application as the control tube in non-linearcoil type modulators/ Here the function of the tube was to permit passage 832 BELL SYSTEM TECHNICAL JOURNAL Eg= 0 VOLTS Esg (volts;) = ^ — 1 1200 ~~ 1000 _22_00 12 ^ 1 / /^ \ooo. —- / ^ 800--- — / 60C -- / y^ aoo •—- r \1200\ 400 -^*. r 0 PLATE CURRENT SCREEN CURRENT. VOLTS Esg (volts) = j2^ — / 3000, -—• r 8 00,—■ -—• / 1600-— -— / ^ aoo,—-— -— 1 f Vi \\ DO \ r*— 1200 ■■ 0
. The Bell System technical journal . Fig. 10—The experimental 426X() vacuum tube. The 5D21 tube also found application as the control tube in non-linearcoil type modulators/ Here the function of the tube was to permit passage 832 BELL SYSTEM TECHNICAL JOURNAL Eg= 0 VOLTS Esg (volts;) = ^ — 1 1200 ~~ 1000 _22_00 12 ^ 1 / /^ \ooo. —- / ^ 800--- — / 60C -- / y^ aoo •—- r \1200\ 400 -^*. r 0 PLATE CURRENT SCREEN CURRENT. VOLTS Esg (volts) = j2^ — / 3000, -—• r 8 00,—■ -—• / 1600-— -— / ^ aoo,—-— -— 1 f Vi \\ DO \ r*— 1200 ■■ 0 PLATE POTENTIAL IN KILOVOLTS Fig. 11—Characteristics of the 426XQ vacuum tube. PULSE MODULATOR TUBES 833 of a moderately high current through an inductance and then suddenly to cutoff the current and withstand the resulting voltage which built up across thecircuit. A schematic of this type of circuit is shown in Fig. 9. In this cir-cuit the tube is required to pass about two amperes peak plate currentwhich builds up over a period of about 150 microseconds. The d-c. volt-age under these conditions is about 1000 to 4000 volts and the screen volt-age may be obtained from the same source through series resistance. Thegrid is driven only slightly positive. Screen-grid dissipation is one of thelimiting factors in this type operation. Primary emission from the screen
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
