Here are two that i had around from someone else's site:
.SUBCKT KTRIODE A G K
+ PARAMS: MU=37.58299 EX=1.132166 KG1=428.9745 KP=402.1368 KVB=321.0256
+ LG=0.2U VBIG=-0.2 EG=1.0389 KG=0.000769 KRG=3.685584 KVG=0.090943
+ CCG=2.4P CGP=3.9P CCP=0.7P CCH=5.6P
E1 7 0 VALUE = {V(A,K) / KP * LOG(1 + EXP(KP * (1/MU + V(G,K) / SQRT(KVB + V(A,K) * V(A,K)))))}
RE1 7 0 1G
G1 A K VALUE = {(PWR(V(7), EX) + PWRS(V(7), EX)) / KG1}
RCP A K 1G ;
C1 G K {CCG} ;
C2 G A {CGP} ;
C3 A K {CCP} ;
C4 K 0 {CCH} ;
E10 10 0 VALUE = {IF(V(A) - V(K) > 0, V(A) - V(K), 0)}
E11 11 0 VALUE = {IF(V(G) - V(K) > VBIG, V(G) - V(K) - VBIG, 0)}
E12 12 0 VALUE = {(KG * (V(11) ** EG) *
+ (((KRG - 1) / (KVG * V(10) + 1)) + 1)) + LG}
G2 G K VALUE = {IF(V(12) > LG, V(12), LG)}
.ENDS
*******************************************************************
.SUBCKT 6N30P-DR A G K
X1 A G K KTRIODE
+ PARAMS: MU=14.82339 EX=1.386938 KG1=255.6717 KP=99.30537 KVB=1042.421
+ LG=0.2U VBIG=-0.1 EG=1.414474 KG=0.000769 KRG=5 KVG=0.027177
+ CCG=6.3P CGP=6.5P CCP=2.4P CCH=8P
.ENDS
.SUBCKT KTRIODE A G K
+ PARAMS: MU=37.58299 EX=1.132166 KG1=428.9745 KP=402.1368 KVB=321.0256
+ LG=0.2U VBIG=-0.2 EG=1.0389 KG=0.000769 KRG=3.685584 KVG=0.090943
+ CCG=2.4P CGP=3.9P CCP=0.7P CCH=5.6P
E1 7 0 VALUE = {V(A,K) / KP * LOG(1 + EXP(KP * (1/MU + V(G,K) / SQRT(KVB + V(A,K) * V(A,K)))))}
RE1 7 0 1G
G1 A K VALUE = {(PWR(V(7), EX) + PWRS(V(7), EX)) / KG1}
RCP A K 1G ;
C1 G K {CCG} ;
C2 G A {CGP} ;
C3 A K {CCP} ;
C4 K 0 {CCH} ;
E10 10 0 VALUE = {IF(V(A) - V(K) > 0, V(A) - V(K), 0)}
E11 11 0 VALUE = {IF(V(G) - V(K) > VBIG, V(G) - V(K) - VBIG, 0)}
E12 12 0 VALUE = {(KG * (V(11) ** EG) *
+ (((KRG - 1) / (KVG * V(10) + 1)) + 1)) + LG}
G2 G K VALUE = {IF(V(12) > LG, V(12), LG)}
.ENDS
*******************************************************************
.SUBCKT 6N30P-DR A G K
X1 A G K KTRIODE
+ PARAMS: MU=14.82339 EX=1.386938 KG1=255.6717 KP=99.30537 KVB=1042.421
+ LG=0.2U VBIG=-0.1 EG=1.414474 KG=0.000769 KRG=5 KVG=0.027177
+ CCG=6.3P CGP=6.5P CCP=2.4P CCH=8P
.ENDS
and this one:
6C45Pi Spice 3F4 model
.subckt 6C45Pi P G K
Bp P K I=(0.005984658048m)*uramp(V(P,K)*ln(1.0+(0.02028899001)+exp((7.114994862)+(7.114994862)*((56.68678595)+(336.3011671m)*V(G,K))*V(G,K)/sqrt((7.450118654e-006)^2+(V(P,K)-(-10.58802286))^2)))/(7.114994862))^(1.976888442)
Cgp G P 4pF
Cgk G K 11pF
Cpk P K 1.9pF
.ends 6C45Pi
6C45Pi Spice 3F4 model
.subckt 6C45Pi P G K
Bp P K I=(0.005984658048m)*uramp(V(P,K)*ln(1.0+(0.02028899001)+exp((7.114994862)+(7.114994862)*((56.68678595)+(336.3011671m)*V(G,K))*V(G,K)/sqrt((7.450118654e-006)^2+(V(P,K)-(-10.58802286))^2)))/(7.114994862))^(1.976888442)
Cgp G P 4pF
Cgk G K 11pF
Cpk P K 1.9pF
.ends 6C45Pi
Or here (dunno if it's the same, spice is beyond me): http://digilander.libero.it/paeng/projects_frame.htm
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