Page:The Bell System Technical Journal, Volume 1, 1922.pdf/16

16 The Success which had attended the development of a tube of this high power capacity indicated the possibility of constructing still larger tubes and it was decided to proceed with the development of a tube capable of delivering at least 100 into an antenna.



The development proceeded with a few minor alterations along the lines of the smaller tube, nominally rated at 10 and the 100  tube as now developed is shown in Figs. 10 and 11. The anode which is made of a piece of seamless copper tubing closed by a copper disc welded into the end, is 14″ long and 3.5″ in diameter. The filament is of tungsten and is .060″ in diameter and 63.5″ long. The current required to heat it is 91 amperes and the power consumed in it 6