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13th November 2013, 10:50 AM  #71 
diyAudio Member

I received an email from Ron Dekker yesterday indicating that the "manual" for the uTracer has been updated.
he's open to suggestions  one of which I pass along  allowing Vg2 to be a mathematical function of Vak  for modeling ultralinear operation. Thus Vg2= k + 40% Vak where k is a constant. i anxiously await V4 which should be able to test higher voltages and higher currents. 
13th November 2013, 03:21 PM  #72 
diyAudio Moderator

I did not know that with Nick Barton's alternative UI, one could generate SPICE model directly with the uTracer until reading Kevin's post above, I think with some work, it could generate Ayumi's models as well. So I am too looking forward to the release of V4 of uTracer.

13th November 2013, 05:30 PM  #73  
diyAudio Member
Join Date: Dec 2005
Location: Lausanne

Quote:
Also, to draw a good SPICE model for the tetrod/pentod, to start from the constant current curves will simplify the model, because the internal tube parameters vary less for a given current than for a given voltage. It is also why I want to try it. The 807 have the same electrical caracteristics than a 6L6. The electrical differences between these 2 tubes are their limits. A 807 can handle 600 Ua and 300V Ug2, when most 6L6 will have big problems with more than 450500 Ua. But for the SPICE model, LTspice or ngspice will not explose and the same model can be used for both tubes. So, it would be great to have a Robert's model for the 807 or 6L6. That in order to be able to compare it with the other models, inclusive the one I will made. But this is nothing urgent, because I am very busy, a lot of urgencies that must be solved, and I just don't have any time for development right now. Last edited by Dominique_free; 13th November 2013 at 05:38 PM. Reason: typos 

13th November 2013, 05:34 PM  #74 
diyAudio Member
Join Date: Feb 2009

[QUOTE=
.model 5Y3 D(Is=1e2 RS=180 Cjo=20p vj=2 N=400 bv=1400 mfg=Stephie type=vacuum ) .model 5R4 D(Is=1e2 RS=150 Cjo=30p vj=2 N=305 bv=3100 mfg=Stephie type=vacuum ) .model 6X4 D(Is=1e2 RS=121 Cjo=20p vj=2 N=256 bv=1250 mfg=Stephie type=vacuum ) .model 5U4 D(Is=1e2 RS=103 Cjo=30p vj=2 N=250 bv=1550 mfg=Stephie type=vacuum ) .model 6AL5 D(Is=1e2 RS=60 Cjo=5p vj=2 N=128 bv=330 mfg=Stephie type=vacuum ) .model 5AR4 D(Is=1e2 RS=36 Cjo=30p vj=2 N=80 bv=1500 mfg=Stephie type=vacuum ) .model 0A2 D(Is=10u Rs=50 Cjo=10p nbv=147 bv=150 Ibv=20m Vpk=150 mfg=Stephie type=zener ) .model 0A3 D(Is=10u Rs=30 Cjo=10p nbv=72 bv=75 Ibv=20m Vpk=75 mfg=Stephie type=zener ) .model 0B2 D(Is=10u Rs=33 Cjo=10p nbv=105 bv=108 Ibv=20m Vpk=108 mfg=Stephie type=zener ) .model 5651 D(Is=1u Rs=1k Cjo=1p nbv=84 bv=85.5 Ibv=2.5m Vpk=85.5 mfg=Stephie type=zener )[/QUOTE] In preamp just practically checked Mullard GZ30. Good spice model. .model GZ30 D(Is=1e2 RS=56 Cjo=30p vj=2 N=80 bv=1400 mfg=Mullard type=vacuum ) 
13th November 2013, 05:56 PM  #75  
diyAudio Moderator

Quote:
Code:
* * Generic pentode model: 6L6 * Copyright 20032008 by Ayumi Nakabayashi, All rights reserved. * Version 3.10, Generated on Sat Mar 8 22:40:38 2008 * Plate *  Screen Grid *   Control Grid *    Cathode *     .SUBCKT 6L6 A G2 G1 K BGG GG 0 V=V(G1,K)+0.91804059 BM1 M1 0 V=(0.10751078*(URAMP(V(G2,K))+1e10))**1.743575 BM2 M2 0 V=(0.4624527*(URAMP(V(GG)+URAMP(V(G2,K))/4.9999386)))**3.243575 BP P 0 V=0.0016883841*(URAMP(V(GG)+URAMP(V(G2,K))/10.811784))**1.5 BIK IK 0 V=U(V(GG))*V(P)+(1U(V(GG)))*0.0021948901*V(M1)*V(M2) BIG IG 0 V=0.0022135943*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)*(0.942171668*(1URAMP(V(A,K))/(URAMP(V(A,K))+10))**1.5+0.057828332) BIK3 IK3 0 V=V(IK2)*(URAMP(V(A,K))+2180)/(URAMP(V(G2,K))+2180) BIK4 IK4 0 V=V(IK3)URAMP(V(IK3)(0.00056920996*(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)(0.00056920996*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 0.6p CGK G1 K 5.7p C12 G1 G2 3.8p CAK A K 5.9p .ENDS Last edited by jazbo8; 13th November 2013 at 06:03 PM. 

13th November 2013, 06:50 PM  #76  
diyAudio Member
Join Date: Dec 2005
Location: Lausanne

Quote:


13th November 2013, 07:05 PM  #77  
diyAudio Member
Join Date: Dec 2005
Location: Lausanne

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14th November 2013, 09:11 PM  #78  
diyAudio Member
Join Date: Sep 2013

Quote:


18th November 2013, 08:58 PM  #79 
diyAudio Member

I was looking for 6ж52п spice models
Spice модели советских ламп для MICROCAP  Страница 4 
24th November 2013, 01:13 AM  #80 
diyAudio Moderator

I'm a little puzzled with the quality of pentode models in spice. I used the uTracer to curve trace eight 6ж9п today and selected one that seemed to match the published curves reasonably well and generated a spice model from it using the alternate gui.
Testing in LTSpice confirmed that it did not match the measured curves closely at all. Extensive tweaking over the course of several hours got me something that looks plausible, but I don't trust it. I subsequently used the trace from one of the tubes to generate a model using paint_kip, and was able to get a good match in the tool, but when I tested it in LTSpice again the results were not great, although much better than the untweaked model I generated using the uTracer. Is it that these models just don't do a good job with high transconductance pentodes or as I now suspect with pentodes in general? I did a quick sloppy trace using paint_kip and generated a model, I then added this model to my LTSpice tube library and tested it, as you can see they do not match at all. (See attachments)
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