. The Bell System technical journal . of 300 megacycles are multi-element tubes. The triode as used at radio frequencies differs from the multi-elementtube chiefly in the manner in which interaction is prevented betweenthe input and output circuits. This is obviously a circuit limitation, ascontrasted with the electron transit time limitation which has receivedso much attention. The greatest opportunity for improvement seemsto be in the direction of improved circuit design. The tubes describedin this paper were developed from this point of view. Sample tubes are shown in Fig. 1. They differ fr
. The Bell System technical journal . of 300 megacycles are multi-element tubes. The triode as used at radio frequencies differs from the multi-elementtube chiefly in the manner in which interaction is prevented betweenthe input and output circuits. This is obviously a circuit limitation, ascontrasted with the electron transit time limitation which has receivedso much attention. The greatest opportunity for improvement seemsto be in the direction of improved circuit design. The tubes describedin this paper were developed from this point of view. Sample tubes are shown in Fig. 1. They differ from previous designs * Digest of a paper presented before International Scientific Radio Union April30, 1937 at Washington, D. C. Published in Proc. I. R. E., October, 1937. 568 NEGATIVE-GRID TRIODE OSCILLATOR AND AMPLIFIER 569 primarily in the lead arrangement. From the section view of one ofthese tubes, shown in Fig. 2, it will be observed that the grid and plateelements are supported by wires which in effect go straight through the. Fig. 2—Section view of one of the double-lead tubes. tube envelope providing two independent leads to each of these ele-ments. The filament leads are at one end only and one of these leadsis extremely short. This unusual lead arrangement possesses a numberof unique advantages.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
