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Vacuum Tube SPICE Models

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rongon

rongon

Member
Joined 2009
S

sulcorebutia

Member
Joined 2009
Looking for directly heated triode 5A6 Ltspice model

Dear All,

I have searched the forum in vain for 5A6 ltspice model. Is it possible to generate one based on the following data?

Datasheet with pentode loadlines, interelectrodes capacitance:
http://rtellason.com/tubedata/5A6.pdf
http://tubedata.jp/sheets/020/5/5A6.pdf

A Gentleman from Japan has made a triode strapped 5a6 loadlines:
5A6三結実測値からLTSPICEモデルの作成 ( オーディオ )

Any pentode or triode model are welcome.

Many thanks in advance.:D
Attached pictures are from the Japanese gentleman's website.
 

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Last edited:
jazbo8

jazbo8

Ex-Moderator
Joined 2011
5A6 SPICE Models

Since the models are derived from a single traced sample, please do not expect high accuracy.

Triode-Connected Model
Code: 
*
* Generic triode model: 5A6_T_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Tue Oct 02 10:49:05 2018
*                Anode
*                | Grid
*                | | Cathode
*                | | |
.SUBCKT 5A6_T_AN A G K
BGG   GG   0 V=V(G,K)+0.99998753
BM1   M1   0 V=(0.015698277*(URAMP(V(A,K))+1e-10))**-0.15008063
BM2   M2   0 V=(0.90904648*(URAMP(V(GG)+URAMP(V(A,K))/5.7938533)+1e-10))**1.6500806
BP    P    0 V=0.00061411819*(URAMP(V(GG)+URAMP(V(A,K))/6.3735501)+1e-10)**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00043471673*V(M1)*V(M2)
BIG   IG   0 V=0.00030705909*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)-(0.00045711939*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK  G    K I=V(IG)
* CAPS
CGA   G    A 0.15p
CGK   G    K 8.5p
CAK   A    K 5.8p
.ENDS

Pentode Model
Code: 
*
* Generic pentode model: 5A6_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Tue Oct 02 10:49:25 2018
*              Anode
*              | Screen Grid
*              | |  Control Grid
*              | |  |  Cathode
*              | |  |  |
.SUBCKT 5A6_AN A G2 G1 K
BGG   GG   0 V=V(G1,K)+0.99998753
BM1   M1   0 V=(0.015698277*(URAMP(V(G2,K))+1e-10))**-0.15008063
BM2   M2   0 V=(0.90904648*(URAMP(V(GG)+URAMP(V(G2,K))/5.7938533)))**1.6500806
BP    P    0 V=0.00061411819*(URAMP(V(GG)+URAMP(V(G2,K))/6.3735501))**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00043471673*V(M1)*V(M2)
BIG   IG   0 V=0.00030705909*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)*(0.86457278*(1-URAMP(V(A,K))/(URAMP(V(A,K))+10))**1.5+0.13542722)
BIK3  IK3  0 V=V(IK2)*(URAMP(V(A,K))+5850)/(URAMP(V(G2,K))+5850)
BIK4  IK4  0 V=V(IK3)-URAMP(V(IK3)-(0.00045711939*(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)-(0.00045711939*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  0.15p
CGK   G1  K  5.1p
C12   G1  G2 3.4p
CAK   A   K  5.8p
.ENDS
 
jazbo8

jazbo8

Ex-Moderator
Joined 2011
2E22 SPICE Model

With a bit of tweaking, I managed to create the pentode model for the 2E22:

Code: 
*
* Generic pentode model: 2E22_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Tue Oct 09 11:41:44 2018
*               Anode
*               | Screen Grid
*               | |  Control Grid
*               | |  |  Cathode
*               | |  |  |
.SUBCKT 2E22_AN A G2 G1 K
BGG   GG   0 V=V(G1,K)+0.95592604
BM1   M1   0 V=(0.027028997*(URAMP(V(G2,K))+1e-10))**-0.35800022
BM2   M2   0 V=(0.80731961*(URAMP(V(GG)+URAMP(V(G2,K))/7.1286551)))**1.8580002
BP    P    0 V=0.00093171905*(URAMP(V(GG)+URAMP(V(G2,K))/8.8300285))**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00055787177*V(M1)*V(M2)
BIG   IG   0 V=0.00046585952*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)*(0.924621412*(1-URAMP(V(A,K))/(URAMP(V(A,K))+10))**1.5+0.075378588)
BIK3  IK3  0 V=V(IK2)*(URAMP(V(A,K))+9110)/(URAMP(V(G2,K))+9110)
BIK4  IK4  0 V=V(IK3)-URAMP(V(IK3)-(0.00062853518*(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)-(0.00062853518*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  0.2p
CGK   G1  K  9p
C12   G1  G2 6p
CAK   A   K  8p
.ENDS
 
K

khutch04

Member
Joined 2016
So, is there a tutorial somewhere that tells me how to generate Spice models? I hate to keep troubling the rest of you! At the moment I am awaiting delivery of a nearly 100 year old radio that I would like to restore to operation. It uses ancient tubes (triodes only) that are likely to be of little interest to anyone here. I take it that some of you use a digital curve tracer of one kind or another. In fact I see the uTracer mentioned not far above and from looking at their website I get some information. At the moment it is too expensive for my purposes. That perception could change if I do too much more tube work but for now I would need a cheaper hardware option, if there are any, or is it possible to generate the models from datasheet curves?
 
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