THEORY OF MULTI-ELECTRODE VACUUM TUBE CIRCUITS 675 

 where 



p _ dip _ 



P6=^^^ Pv 



2. P =z 



dEb' ' dE 



dip p _ 



2dEa^' ^' 2dE, 



dUr 



dEadEb 



,Ps = 



dUr. 



dEadEj 



,P9 = 



dU. 



dEbdE. 



and similar expressions hold for the A- and 5-values. 

 The electrode resistances are by definition 



1 



The mu-factors are 



t^pa 



P'ap 



IJibp 



fJ-pb 



tiab 



(26) 



(27) 



(28) 



