Try this:
Code:
.SUBCKT NU6P1 1 2 3
+params: MU= 18.10 EX= 4.080 KG1=4270851.9 KP=451.94 KVB= 4.2 VCT= 0.00 RGI=330k CCG=9.1P CGP=2.5P CCP=4.3P
E1 7 0 VALUE=
+{V(1,3)/KP*LOG(1+EXP(KP*(1/MU+V(2,3)/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER
C1 2 3 {CCG} ; CATHODE-GRID
C2 2 1 {CGP} ; GRID=PLATE
C3 1 3 {CCP} ; CATHODE-PLATE
D3 5 3 DX ; FOR GRID CURRENT
R1 2 5 {RGI} ; FOR GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS
the datasheet have the curve, is enought?
http://www.mif.pg.gda.pl/homepages/frank/sheets/137/6/6CM8.pdf
http://www.mif.pg.gda.pl/homepages/frank/sheets/137/6/6CM8.pdf
6BN11 SPICE Model
Code:
*
* Generic pentode model: 6BN11_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Sat Nov 01 18:19:03 2014
* Plate
* | Screen Grid
* | | Control Grid
* | | | Cathode
* | | | |
.SUBCKT 6BN11_AN A G2 G1 K
BGG GG 0 V=V(G1,K)+0.80333486
BM1 M1 0 V=(0.016690499*(URAMP(V(G2,K))+1e-10))**-1.028498
BM2 M2 0 V=(0.59323756*(URAMP(V(GG)+URAMP(V(G2,K))/24.370897)))**2.528498
BP P 0 V=0.0032099434*(URAMP(V(GG)+URAMP(V(G2,K))/41.081176))**1.5
BIK IK 0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.0021774044*V(M1)*V(M2)
BIG IG 0 V=0.0016049717*URAMP(V(G1,K))**1.5*(URAMP(V(G1,K))/(URAMP(V(A,K))+URAMP(V(G1,K)))*1.2+0.4)
BIK2 IK2 0 V=V(IK,IG)*(1-0.4*(EXP(-URAMP(V(A,K))/URAMP(V(G2,K))*15)-EXP(-15)))
BIG2T IG2T 0 V=V(IK2)*(0.75853563*(1-URAMP(V(A,K))/(URAMP(V(A,K))+10))**1.5+0.24146437)
BIK3 IK3 0 V=V(IK2)*(URAMP(V(A,K))+3175)/(URAMP(V(G2,K))+3175)
BIK4 IK4 0 V=V(IK3)-URAMP(V(IK3)-(0.001722887*(URAMP(V(A,K))+URAMP(URAMP(V(G2,K))-URAMP(V(A,K))))**1.5))
BIP IP 0 V=URAMP(V(IK4,IG2T)-URAMP(V(IK4,IG2T)-(0.001722887*URAMP(V(A,K))**1.5)))
BIAK A K I=V(IP)+1e-10*V(A,K)
BIG2 G2 K I=URAMP(V(IK4,IP))
BIGK G1 K I=V(IG)
* CAPS
CGA G1 A 0.03p
CGK G1 K 7.2p
C12 G1 G2 4.8p
CAK A K 2.8p
.ENDS
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