6BQ5

.SUBCKT 6BQ5 A S G K
*
* Calculate contribution to cathode current
*
Eat     at      0       VALUE={0.636*ATAN(V(A,K)/15)}
Egs     gs      0       VALUE={LIMIT{V(S,K)/19+V(G,K)+V(A,K)/1400,0,1E6}}
Egs2    gs2     0       VALUE={PWRS(V(gs),1.5)}
Ecath   cc      0       VALUE={V(gs2)*V(at)}
*
* Calculate anode current
*
Ga      A       K       VALUE={3.2E-3*V(cc)}
*
* Calculate screen current
*
Escrn   sc      0       VALUE={V(gs2)*(1.1-V(at))}
Gs      S       K       VALUE={2.0E-3*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
*
Cg1     G       K       10.8p
Cak     A       K       6.5p
Cg1a    G       A       0.5p

.ENDS

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