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13th September 2015, 05:56 PM  #981 
diyAudio Member
Join Date: Jan 2004
Location: n.e england

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.

13th September 2015, 06:14 PM  #982  
diyAudio Moderator

Quote:
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. 

13th September 2015, 07:46 PM  #983 
diyAudio Member
Join Date: Dec 2009
Location: Newnan GA

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

14th September 2015, 11:05 AM  #984 
diyAudio Member
Join Date: Sep 2009
Location: Santa Fe, Argentina

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. 
14th September 2015, 11:38 AM  #985 
diyAudio Moderator

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.

14th September 2015, 04:16 PM  #986 
diyAudio Member
Join Date: Sep 2009
Location: Santa Fe, Argentina

Ok, so I can expect Ayumi's models to work Ok triode connected, as the real thing?
Good to know. Cheers J. 
18th September 2015, 04:02 AM  #987 
diyAudio Member
Join Date: Jul 2009
Location: Across the river from Rip's big old tree...

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.  
18th September 2015, 07:19 AM  #988 
diyAudio Member

I am looking for LTSpice model (EML) 1605.

18th September 2015, 08:28 AM  #989 
diyAudio Moderator

6P15P SPICE Models
Pentode
Code:
* * Generic pentode model: 6P15P_AN * Copyright 20032008 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))+1e10))**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)+(1U(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)*(10.4*(EXP(URAMP(V(A,K))/URAMP(V(G2,K))*15)EXP(15))) BIG2T IG2T 0 V=V(IK2)*(0.87412329*(1URAMP(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)+1e10*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 Code:
* * Generic triode model: 6P15P_T_AN * Copyright 20032008 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))+1e10))**1.1736118 BM2 M2 0 V=(0.56103882*(URAMP(V(GG)+URAMP(V(A,K))/15.745382)+1e10))**2.6736118 BP P 0 V=0.0078884298*(URAMP(V(GG)+URAMP(V(A,K))/28.064693)+1e10)**1.5 BIK IK 0 V=U(V(GG))*V(P)+(1U(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)))+1e10*V(A,K) BIGK G K I=V(IG) * CAPS CGA G A 0.07p CGK G K 14p CAK A K 8p .ENDS 
18th September 2015, 08:29 AM  #990 
diyAudio Moderator

EML1605 SPICE Model
Code:
* * Generic triode model: EML1605_AN * Copyright 20032008 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))+1e10))**0.54146639 BM2 M2 0 V=(0.73476596*(URAMP(V(GG)+URAMP(V(A,K))/4.8024339)+1e10))**2.0414664 BP P 0 V=0.0021283493*(URAMP(V(GG)+URAMP(V(A,K))/6.5360049)+1e10)**1.5 BIK IK 0 V=U(V(GG))*V(P)+(1U(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)))+1e10*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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