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Vacuum Tube SPICE Models
Vacuum Tube SPICE Models
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Old 13th September 2015, 05:56 PM   #981
jez is offline jez  United Kingdom
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Quote:
Originally Posted by jazbo8 View Post
For the tubes that you listed, any of the commonly available models will work.
Yes I know and they do. There are wild variations in simulated performance between models used though. What I'm asking is has anyone done the work to find which ones can be trusted. For example I have an amp I've simulated using 12AX7's which, depending on which model I use gives as high as 0.5%THD or as low as 0.0008%! I rather distrust the latter reading.... and the former would be most disappointing. I'm going to have to build it now to see how it actually performs as the range of the results of simulation are so wide as to be useless. Hence I'm asking if there are tried and tested trustworthy models.
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Old 13th September 2015, 06:14 PM   #982
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Quote:
Originally Posted by jez View Post
For example I have an amp I've simulated using 12AX7's which, depending on which model I use gives as high as 0.5%THD or as low as 0.0008%! I rather distrust the latter reading.... and the former would be most disappointing. I'm going to have to build it now to see how it actually performs as the range of the results of simulation are so wide as to be useless. Hence I'm asking if there are tried and tested trustworthy models.
Yes, the one that gives 0.0008% should be toss out immediately. 0.5% doesn't seem too far fetched, well without knowing what you are simulating or which models that you are using, it is difficult to comment. But the popular ones like the Koren, Ayumi or Frolov models should all have similar results.

Multisim is not a common program that people used around here, so you will be hard pressed to find the models (let alone Ayumi model) for it, unless some other Multisim users make them available. Perhaps you can PM the person and ask for his Ayumi models.
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Old 13th September 2015, 07:46 PM   #983
Triodethom is offline Triodethom  United States
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I do not understand about a " conversion of Ayumi models the pspice ones he generated are the ones to use with multisims 12 and above. Jez schematic on the 12ax7 circuit in question please. and which model did generate .0008 % and the model that generated .5% . Regards
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Old 14th September 2015, 11:05 AM   #984
Mosquito is offline Mosquito  Argentina
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Hi,
There are triode strapped Spice models of most common tetrodes, and power pentodes out there?
I was googling for *.subckt's with no success
thanks
J.
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Old 14th September 2015, 11:38 AM   #985
jazbo8 is offline jazbo8
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Yes, there are some available, but if the tetrode/pentode models were built correctly, then you can just connect them as triodes in your sim program, and they should work fine. Of course, if you are using Koren's pentode models, then don't expect them to work well, since the screen grid current are poorly modeled.
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Old 14th September 2015, 04:16 PM   #986
Mosquito is offline Mosquito  Argentina
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Ok, so I can expect Ayumi's models to work Ok triode connected, as the real thing?
Good to know.
Cheers
J.
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Old 18th September 2015, 04:02 AM   #987
rongon is offline rongon  United States
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Speaking of running Ayumi's models triode connected...

I just realized that the only SV83 or 6P15P model I have is the Duncan Munro SV83 model. Is there an Ayumi model of 6P15P or EL83 (SV83)? A triode model would be fine, since that's the way I'm going to use it, but I'll be happy to use a pentode/tetrode model.

Thanks.
--
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Old 18th September 2015, 07:19 AM   #988
euro21 is online now euro21  Hungary
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Vacuum Tube SPICE Models
I am looking for LTSpice model (EML) 1605.
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Old 18th September 2015, 08:28 AM   #989
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Default 6P15P SPICE Models

Pentode
Code:
*
* Generic pentode model: 6P15P_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Fri Sep 18 10:19:14 2015
*                Plate
*                | Screen Grid
*                | |  Control Grid
*                | |  |  Cathode
*                | |  |  |
.SUBCKT 6P15P_AN A G2 G1 K
BGG   GG   0 V=V(G1,K)+-0.58288162
BM1   M1   0 V=(0.027878725*(URAMP(V(G2,K))+1e-10))**-1.1736118
BM2   M2   0 V=(0.56103882*(URAMP(V(GG)+URAMP(V(G2,K))/15.745382)))**2.6736118
BP    P    0 V=0.0078884298*(URAMP(V(GG)+URAMP(V(G2,K))/28.064693))**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.005914561*V(M1)*V(M2)
BIG   IG   0 V=0.0039442149*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)*(0.87412329*(1-URAMP(V(A,K))/(URAMP(V(A,K))+10))**1.5+0.12587671)
BIK3  IK3  0 V=V(IK2)*(URAMP(V(A,K))+4012.5)/(URAMP(V(G2,K))+4012.5)
BIK4  IK4  0 V=V(IK3)-URAMP(V(IK3)-(0.004369569*(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)-(0.004369569*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  0.07p
CGK   G1  K  8.4p
C12   G1  G2 5.6p
CAK   A   K  8p
.ENDS
Triode-Connected
Code:
*
* Generic triode model: 6P15P_T_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Fri Sep 18 10:19:41 2015
*                  Plate
*                  | Grid
*                  | | Cathode
*                  | | |
.SUBCKT 6P15P_T_AN A G K
BGG   GG   0 V=V(G,K)+-0.58288162
BM1   M1   0 V=(0.027878725*(URAMP(V(A,K))+1e-10))**-1.1736118
BM2   M2   0 V=(0.56103882*(URAMP(V(GG)+URAMP(V(A,K))/15.745382)+1e-10))**2.6736118
BP    P    0 V=0.0078884298*(URAMP(V(GG)+URAMP(V(A,K))/28.064693)+1e-10)**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.005914561*V(M1)*V(M2)
BIG   IG   0 V=0.0039442149*URAMP(V(G,K))**1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+0.4)
BIAK  A    K I=URAMP(V(IK,IG)-URAMP(V(IK,IG)-(0.004369569*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK  G    K I=V(IG)
* CAPS
CGA   G    A 0.07p
CGK   G    K 14p
CAK   A    K 8p
.ENDS
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Old 18th September 2015, 08:29 AM   #990
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Default EML1605 SPICE Model

Code:
*
* Generic triode model: EML1605_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Fri Sep 18 10:29:17 2015
*                  Plate
*                  | Grid
*                  | | Cathode
*                  | | |
.SUBCKT EML1605_AN A G K
BGG   GG   0 V=V(G,K)+-1
BM1   M1   0 V=(0.055229088*(URAMP(V(A,K))+1e-10))**-0.54146639
BM2   M2   0 V=(0.73476596*(URAMP(V(GG)+URAMP(V(A,K))/4.8024339)+1e-10))**2.0414664
BP    P    0 V=0.0021283493*(URAMP(V(GG)+URAMP(V(A,K))/6.5360049)+1e-10)**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.0012258387*V(M1)*V(M2)
BIG   IG   0 V=0.0010641746*URAMP(V(G,K))**1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+0.4)
BIAK  A    K I=URAMP(V(IK,IG)-URAMP(V(IK,IG)-(0.0015708586*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK  G    K I=V(IG)
* CAPS
CGA   G    A 15p
CGK   G    K 8.5p
CAK   A    K 5p
.ENDS
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