. The Bell System technical journal . grids by a low im- pedance conductor. (3) A method of grounding the screen and suppressor grids inside the tube envelope. (4) Complete shielding between input and output sides of the tube. (5) The use of extremely short leads. (6) Means for maintaining very small spacings between the elements. (7) Provision for adequate cooling of all grids. (8) Adequate insulation paths to permit a high anode potential. (9) The absence of any leads common to both input and output circuits. The first of the experimental tubes designed to have a fifteen-wattdissipation per
. The Bell System technical journal . grids by a low im- pedance conductor. (3) A method of grounding the screen and suppressor grids inside the tube envelope. (4) Complete shielding between input and output sides of the tube. (5) The use of extremely short leads. (6) Means for maintaining very small spacings between the elements. (7) Provision for adequate cooling of all grids. (8) Adequate insulation paths to permit a high anode potential. (9) The absence of any leads common to both input and output circuits. The first of the experimental tubes designed to have a fifteen-wattdissipation per anode is shown in Fig. 1. It will be noted that a parti-tion divides the envelope into two parts. This partition is in realitydouble, being made up of two sheets, one being connected to the sup- 14 BELL SYSTEM TECHNICAL JOURNAL pressor grids and the mid-point of the filament circuit and the otherbeing connected to the screen grids. Slots in these sheets provide spaceto mount the tube elements. The capacitance between the two closely. Fig. 1—An early experimental type tube. spaced sheets forms an effective radio-frequency by-pass condenserbetween the screen grids and the filaments. Fig. 2 is a section view
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
