this simulation introduces an older model, using GE data instead of RCA ... 
this model has great converging capabilities but less tight fit than "demo" model


Common cathode transfer function sweep

Vsup 99 0 300
Rp 99 2 100k
Vg 1 0 0 

Rc 3 0 1.5k

x1 2 1 3 triode_GE12ax7wa

************************* p g c ***************************************************
.subckt triode_GE12ax7wa  1 2 3
*************************  
eGIog1 20 0 value={log(v(1,3))}
rGlog1 20 0 1
eG0 10 0 poly(1) <2,3>    -3.2813e+00   1.7569e+00   2.9338e-02  
eG1 11 0 poly(1) <2,3>    -9.0720e-02  -2.7519e-02  -3.0229e-03 
eG2 12 0 poly(1) <2,3>    -1.8084e-02   4.2859e-03   1.7988e-04  
eG3 13 0 poly(1) <2,3>     1.1015e-03   4.2800e-04   1.0427e-04  
rG0 10 0 1
rG1 11 0 1
rG2 12 0 1
rG3 13 0 1
gG   2 3 value={(exp(v(10)+v(20)*(v(11)+v(20)*(v(12)+v(20)*v(13)))))/189}
eP0 110 0 poly(1) <2,3> -1.6702e+00  3.9084e+00 -1.5799e+00 -1.3727e-01 -1.0348e-03 
eP1 111 0 poly(1) <2,3>  1.1947e-01 -3.2355e-01  2.4620e-01  6.2866e-02  3.9416e-03  
eP2 112 0 poly(1) <2,3>  6.9903e-02 -7.3976e-02 -4.3982e-02 -6.3812e-03 -2.9682e-04 
eP3 113 0 poly(1) <2,3>  4.2712e-03  3.4864e-03  8.3734e-03  4.4558e-04 -8.4579e-06  
rP0 110 0 1
rP1 111 0 1
rP2 112 0 1
rP3 113 0 1
gP    1 3 value={(exp(v(110)+v(20)*(v(111)+v(20)*(v(112)+v(20)*v(113))))/1000)}
Cgc 2 3 1.8p
Cgp 2 1 1.7p
Cpc 1 3 1.9p
.ends

.dc Vg -5 6 0.1

.probe
.end


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