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.
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.
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.
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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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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6P15P SPICE Models
Pentode
Triode-Connected
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
.ENDSTriode-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
.ENDSEML1605 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
.ENDSThe 6P15P models are based on the curves traced by Ale Moglia, as a result, the pentode model deviates a bit from the datasheet, but it should be close enough for simulation purposes.
GM-70 SPICE Model
Code:
*
* Generic triode model: GM-70_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Sun Sep 06 16:23:51 2015
* Plate
* | Grid
* | | Cathode
* | | |
.SUBCKT GM-70_AN A G K
BGG GG 0 V=V(G,K)+0.99982909
BM1 M1 0 V=(0.018934714*(URAMP(V(A,K))+1e-10))**-0.24762242
BM2 M2 0 V=(0.85830897*(URAMP(V(GG)+URAMP(V(A,K))/7.4831353)+1e-10))**1.7476224
BP P 0 V=0.00064240583*(URAMP(V(GG)+URAMP(V(A,K))/8.7184634)+1e-10)**1.5
BIK IK 0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.00041123885*V(M1)*V(M2)
BIG IG 0 V=0.00032120292*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)-(0.00043483915*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK G K I=V(IG)
* CAPS
CGA G A 12p
CGK G K 8p
CAK A K 4p
.ENDSI'll have to look at that again, I thought it was just the pentode model. I must have overlooked it.
Thanks for the quick reply!
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