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BELL SYSTEM TECHNICAL JOURNAL 



Accordingly there are tabulated below the maximum power con- 

 ditions for a number of tubes of different structure with plate potentials 

 from 120 to 350 volts, operated under the conditions for maximum 

 power output. 



Conditions for Maximum Power 



The last four columns represent computations by the double series 

 method which are to be compared with the approximate relations of 

 Eq. (10). Thus /1//2 of the last column is given as 16 when n- 

 variation is neglected whereas it actually varies between 5.48 and 

 7.50; i?/i?o on the approximate theory is put at 4, whereas it varies 

 actually between 4.1 and 5.4; WIJ2 is given as 2Ep which actually 

 comes out close to half that, and finally the PIW'is given as 8, while it 

 really varies between 3.8 and 5.4. On the other hand, the approximate 

 independence of tube structure is shown by these four ratios as given 

 in the last four columns of figures. 



