Index of content:
Volume 9, Issue 7, 01 July 1938
9(1938); http://dx.doi.org/10.1063/1.1710436View Description Hide Description
9(1938); http://dx.doi.org/10.1063/1.1710441View Description Hide Description
9(1938); http://dx.doi.org/10.1063/1.1710442View Description Hide Description
This paper describes a new method of precalculating the performance of a power tube from its static characteristic curves. The 60‐cycle test method is also briefly outlined and the results of the two methods compared and discussed. An appendix discusses the effect of secondary emission from the plate and grid and primary emission from the grid on the performance of the tube.
9(1938); http://dx.doi.org/10.1063/1.1710443View Description Hide Description
9(1938); http://dx.doi.org/10.1063/1.1710444View Description Hide Description
Amongst electric waves that can be propagated inside metal tubes of circular cross section there are some with attenuation constants diminishing indefinitely with increasing frequency. The purpose of this note is to discuss what happens to these waves as the tubes are slightly deformed from perfect circularity. The conclusion is that in a deformed tube the attenuation constants of the above‐mentioned waves diminish with increasing frequency until a certain frequency is reached, depending upon the degree of departure from perfect circularity, and then they begin to increase indefinitely with further increase in frequency.