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Vacuum Tube SPICE Models

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nl3prc

nl3prc

Member
Joined 2012
nl3prc.nl
padamiecki said:
I have standard directives for the simulations and I copied them for simulations, yes cordell-models.txt is not necessary.
20kHz is for the same reasons, you can easy change it to any frequency you want.
30Hz sim is not bad too.
Click to expand...

My setup would be something like below
 

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jazbo8

jazbo8

Ex-Moderator
Joined 2011
nl3prc said:
I tied to simulate with the Ayumi model but this is not workin
I changed the ^ into ** but no luck
I made a model according to Koren models and this seems to work
Click to expand...

Ayumi's model works fine in LTSpice... while the EL12 Koren model you posted seems to deviate from the datasheet quite a bit.:confused:

An externally hosted image should be here but it was not working when we last tested it.
 
nl3prc

nl3prc

Member
Joined 2012
nl3prc.nl
I think that this is also the case with different manufactures of tubes
A Philips wil be different than a RCA

I dit found out somthing else when you look at the G2 they react different
while the Norman models react liniar the Ayumi is not.
 

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jazbo8

jazbo8

Ex-Moderator
Joined 2011
Sorry to sound like a broken record, but the screen current is poorly modeled using the Koren method. It could be improved, please refer to Dr. Gurskii's article in AA (just a bit better) or Dr. Reefman's improved methodology (great improvement), which requires the uTracer to really take advantage of it.
 
R

Ray Waters

Member
Joined 2010
jazbo8 said:
Sorry to sound like a broken record, but the screen current is poorly modeled using the Koren method. It could be improved, please refer to Dr. Gurskii's article in AA (just a bit better) or Dr. Reefman's improved methodology (great improvement), which requires the uTracer to really take advantage of it.
Click to expand...

Do you know if anyone has developed a library of models for some of the common pentodes using the Reefman method? I've been using the Ayumi models because, as you note, the Koren method does not model screen current well, but I'm always on the lookout for something better.
 
RajkoM

RajkoM

Member
Joined 2009
Jazbo8,
by this method, EF80_pentode and EF_triode have identical models.
In practice, I have not encountered such a pentode.


****************************************************
.SUBCKT EF80 1 2 3 4 ; A G2 G1 C;
* ExtractModel V .997
* Model created: 07-Dec-13
X1 1 2 3 4 PenthodeDE MU= 54.7 EX=1.202 kG1= 136.4 KP= 340.3 kVB = 4670.0 kG2= 584.2
+ Ookg1mOokG2=.56E-02 Aokg1=.23E-05 alkg1palskg2=.56E-02 be= .054 als= 3.09 RGI=2000
+ CCG1=7.5P CCG2=5.4P CPG1 = 0.007p CG1G2 = 2.6p CCP=0.012P ;
.ENDS
****************************************************
.SUBCKT EF80_triode 1 2 3; A G C;
* ExtractModel V .997
* Model created: 07-Dec-13
X1 1 2 3 TriodeK MU= 54.7 EX=1.202 KG1= 136.4 KP= 340.3 KVB= 4670. RGI=2000
+ CCG=7.5P CGP=2.6P CCP=0.0P ;
.ENDS
 
jazbo8

jazbo8

Ex-Moderator
Joined 2011
RajkoM said:
Jazbo8,
by this method, EF80_pentode and EF_triode have identical models.
In practice, I have not encountered such a pentode.
Click to expand...
You are right, they do look odd, but I have no experience with this particular tube. The triode curve seems to deviate quite a bit from an example I found on the net. May be someone with EF80 can verify the results.

An externally hosted image should be here but it was not working when we last tested it.
 
jazbo8

jazbo8

Ex-Moderator
Joined 2011
EF50 Pentode SPICE Model

Please try this one, it's not quite perfect, but should get you started...

Code: 
*
* Generic pentode model: EF50_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Tue Jul 15 13:48:26 2014
*               Plate
*               | Screen Grid
*               | |  Control Grid
*               | |  |  Cathode
*               | |  |  |
.SUBCKT EF50_AN A G2 G1 K
BGG   GG   0 V=V(G1,K)+0.075140135
BM1   M1   0 V=(0.016755255*(URAMP(V(G2,K))+1e-10))^-1.7905817
BM2   M2   0 V=(0.45584646*(URAMP(V(GG)+URAMP(V(G2,K))/32.476589)))^3.2905817
BP    P    0 V=0.0062465593*(URAMP(V(GG)+URAMP(V(G2,K))/71.244579))^1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.008577125*V(M1)*V(M2)
BIG   IG   0 V=0.0031232796*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)*(0.62975016*(1-URAMP(V(A,K))/(URAMP(V(A,K))+10))^1.5+0.37024984)
BIK3  IK3  0 V=V(IK2)*(URAMP(V(A,K))+11000)/(URAMP(V(G2,K))+11000)
BIK4  IK4  0 V=V(IK3)-URAMP(V(IK3)-(0.0032552566*(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)-(0.0032552566*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  0.003p
CGK   G1  K  6p
C12   G1  G2 4p
CAK   A   K  5.3p
.ENDS
 
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