Vacuum Tube SPICE Models

nl3prc · 2014-12-07 1:46 pm

Before i forget the complete topic on this can be found http://www.diyaudio.com/forums/tubes-valves/181578-spice-transformer-model-spreadsheet.html

nl3prc · 2014-12-07 2:19 pm

And this is a simple test file i made with one of the models

nl3prc · 2014-12-19 1:44 pm

On what page can i find a Ayumi model for the GU50

jazbo8 · 2014-12-19 2:07 pm

I think this one is the best so far. The Ayumi model from JA2DHC unfortunately isn't very accurate.

nl3prc · 2014-12-20 10:48 am

I just lookt at the model i have it seems that i forgot to change one of the ^ to ** my bad

Now it's workin

Code:

*
* Generic pentode model: GU50_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Sat Jan 11 08:13:44 2014
*               Plate
*               | Screen Grid
*               | |  Control Grid
*               | |  |  Cathode
*               | |  |  |
.SUBCKT GU50_AN A G2 G1 K
BGG   GG   0 V=V(G1,K)+0.45288699
BM1   M1   0 V=(0.10715305*(URAMP(V(G2,K))+1e-10))**-1.1401545
BM2   M2   0 V=(0.56814856*(URAMP(V(GG)+URAMP(V(G2,K))/4.0302301)))**2.6401545
BP    P    0 V=0.0015719333*(URAMP(V(GG)+URAMP(V(G2,K))/7.0936201))**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.0011497682*V(M1)*V(M2)
BIG   IG   0 V=0.00078596663*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)*(0.916000233*(1-URAMP(V(A,K))/(URAMP(V(A,K))+10))**1.5+0.083999767)
BIK3  IK3  0 V=V(IK2)*(URAMP(V(A,K))+2101.25)/(URAMP(V(G2,K))+2101.25)
BIK4  IK4  0 V=V(IK3)-URAMP(V(IK3)-(0.0011298169*(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)-(0.0011298169*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  0.1p
CGK   G1  K  8.4p
C12   G1  G2 5.6p
CAK   A   K  9.2p
.ENDS GU50_AN

jazbo8 · 2014-12-20 12:01 pm

I think that's the one I converted from JA2DHC's code, which is not that accurate and should be discarded, you should try using the one Rajkom posted above.

nl3prc · 2014-12-21 1:01 pm

It work's

jazbo8 · 2014-12-21 3:37 pm

Yes it works, but just not that accurate, i.e., the simulation result may be quite different from the real thing...

Ray Waters · 2014-12-22 10:58 pm

jazbo,

I looked at the LTspice schematic and see that there are two version of the GU50 pentode model. I assume the one with the underscore (GU50_P) is for LTspice and the other one (GU50P) is for another simulator. If this is correct, can you provide an LTspice model for the triode-connected GU50? The GU50T model appears to be for the "other" simulator.

Thanks.

Ray

jazbo8 · 2014-12-23 7:17 am

Revised Ayumi GU50 Triode Model

If you mean the file uploaded by RajkoM, then yes, you should discard all of the Ayumi models in that file, as none of them is considered accurate. I made a new triode-strapped model for the GU50 as follows:

Code:

*
* Generic triode model: GU50T_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Thu Dec 04 06:55:48 2014
*                Plate
*                | Grid
*                | | Cathode
*                | | |
.SUBCKT GU50T_AN A G K
BGG   GG   0 V=V(G,K)+0.99999998
BM1   M1   0 V=(0.10436399*(URAMP(V(A,K))+1e-10))**-0.94152684
BM2   M2   0 V=(0.61436966*(URAMP(V(GG)+URAMP(V(A,K))/3.6950516)+1e-10))**2.4415268
BP    P    0 V=0.00094208742*(URAMP(V(GG)+URAMP(V(A,K))/6.0143784)+1e-10)**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00060765818*V(M1)*V(M2)
BIG   IG   0 V=0.00047104371*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)-(0.00071551401*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK  G    K I=V(IG)
* CAPS
CGA   G    A 0.1p
CGK   G    K 14p
CAK   A    K 9.2p
.ENDS

I will try to make a new one for the pentode when I get a chance.

nl3prc · 2014-12-23 10:21 am

I'm looking for a LTSpice model for the P(E)CL86

jazbo8 · 2014-12-23 10:47 am

nl3prc said:
I'm looking for a LTSpice model for the P(E)CL86

ECL86 = 6GW8 and is included in the Ayumi library.

nl3prc · 2014-12-23 11:01 am

Found it thanks

nl3prc · 2014-12-23 12:06 pm

I found the pentode part of the 6gw8 however the triode part that's in the lib looks like the pentode as triode so i'm still looking for the triode part of the PCL86 ( 6GW8 )

nl3prc · 2014-12-23 1:17 pm

Found a simple directive

Code:

.subckt PCL86t p g c
Rg g c 10Meg
Cg g c 2p3
Cp g p 1p4
Cc p c 2p5
Bp p c I=840n*
+ln(1+uramp(V(p,c)))*
+((45+V(p,c)+83*V(g,c))/
+(1+uramp(V(g,c)/-1.7)))**1.25
.ends

Ray Waters · 2014-12-23 3:02 pm

jazbo8 said:
I will try to make a new one for the pentode when I get a chance.

Thanks!

jazbo8 · 2014-12-23 3:32 pm

nl3prc said:
I found the pentode part of the 6gw8 however the triode part that's in the lib looks like the pentode as triode so i'm still looking for the triode part of the PCL86 ( 6GW8 )

You are right, Ayumi only made the pentode and triode-strapped pentode models. I will try to make one for triode soon.

RajkoM · 2014-12-23 4:02 pm

Hmm. In Ayumi library which I have, there is a pure triode model. Works perfectly with triode sym:

* Generic triode model: 6GW8PT
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Sat Mar 8 22:40:12 2008
* Plate
* | Grid
* | | Cathode
* | | |
.SUBCKT 6GW8PT A G K
BGG GG 0 V=V(G,K)+0.84112562
BM1 M1 0 V=(0.01029284*(URAMP(V(A,K))+1e-10))**-0.37211195
BM2 M2 0 V=(0.80123414*(URAMP(V(GG)+URAMP(V(A,K))/19.311081)+1e-10))**1.872112
BP P 0 V=0.0043151181*(URAMP(V(GG)+URAMP(V(A,K))/24.10167)+1e-10)**1.5
BIK IK 0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.0025686773*V(M1)*V(M2)
BIG IG 0 V=0.0021575591*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)-(0.002428883*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK G K I=V(IG)
* CAPS
CGA G A 4.2p
CGK G K 5.8p
CAK A K 7.6p
.ENDS

jazbo8 · 2014-12-23 4:18 pm

ECL86_6GW8 Triode Section Model

RajkoM said:
Hmm. In Ayumi library which I have, there is a pure triode model. Works perfectly with triode sym:

Well, that's the triode-strapped pentode model, try comparing it to the curves from the triode section, they won't match up... Then try this one for the triode section:

Code:

*
* Generic triode model: ECL86T_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Tue Dec 23 17:15:39 2014
*                 Plate
*                 | Grid
*                 | | Cathode
*                 | | |
.SUBCKT ECL86T_AN A G K
BGG   GG   0 V=V(G,K)+0.56606473
BM1   M1   0 V=(0.0020906314*(URAMP(V(A,K))+1e-10))**-0.32938621
BM2   M2   0 V=(0.81994714*(URAMP(V(GG)+URAMP(V(A,K))/86.123674)+1e-10))**1.8293862
BP    P    0 V=0.0010401382*(URAMP(V(GG)+URAMP(V(A,K))/105.03564)+1e-10)**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00063128844*V(M1)*V(M2)
BIG   IG   0 V=0.00052006911*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)-(0.00053495848*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK  G    K I=V(IG)
* CAPS
CGA   G    A 1.4p
CGK   G    K 2.3p
CAK   A    K 2.5p
.ENDS

RajkoM · 2014-12-23 4:26 pm

I see, thanks jazbo. You're our hero

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