The thermionic vacuum tube and its applications (1920)
Van der Bijl, Hendrik Johannes, 1887- · New York McGraw-Hill Book, Co · leaf 264
ed from the top by means of a block of lavite. The lowerpart of the plate forms a collar which fits tightly round the re-entrant tube. The double plates and grids are each stamped inone piece from sheet metal, thus facilitating quantity production.A tube of simple construction manufactured by the… … 10,000 placed over the grid and filament. The grid is in the form of ahelix enclosing the filament which is Hkewise helical and consistsof tungsten wire. In one t>T3e of tube of this construction the normal operatingfilament current is 1.1 amperes and the filament voltage o.G volts.The…
Telegraph, Wireless
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