6KG6

.SUBCKT 6KG6 A S G K
*
* Calculate contribution to cathode current
*
Eat     at      0       VALUE={0.636*ATAN(V(A,K)/20)}
Eme     me      0       VALUE={PWR(LIMIT{V(A,K),0,10000},1.5)/17}
Emu     mu      0       VALUE={PWRS(V(G,K),1-(LIMIT{-V(G,K),5,9999}-5)/1150)}
Egs     gs      0       VALUE={LIMIT{V(S,K)/19+V(mu)/4.3+V(A,K)/800,0,1E6}}
Egs2    gs2     0       VALUE={PWRS(V(gs),1.5)}
Ecath   cc      0       VALUE={LIMIT{V(gs2)*V(at),0,V(me)}}
Elim    el      0       VALUE={LIMIT{V(gs2)*V(at)-V(cc),0,99999}}
*
* Calculate anode current
*
Ga      A       K       VALUE={6E-2*V(cc)}
*
* Calculate screen current
*
Escrn   sc      0       VALUE={V(gs2)*(1.1-V(at))+1.2*V(el)}
Gs      S       K       VALUE={1.2E-2*V(sc)*LIMIT{V(S,K),0,10}/10}
*
* Grid current (approximation - does not model low va/vs)
*
Gg      G       K       VALUE={PWR(LIMIT{V(G,K)+1,0,1E6},1.5)*50E-6}
*
* Capacitances
* NOTE: Change Cg1 from 37p to 25p for Svetlana EL509
*
Cg1     G       K       37p
Cak     A       K       18.5p
Cg1a    G       A       2.5p

.ENDS

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