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29th November 2013, 04:41 PM  #91 
diyAudio Member

Here is a model for the C3g, have a box of these in the basement but never got around to play with them......
C3g simulation model
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29th November 2013, 08:17 PM  #92 
diyAudio Member

Help wanted...
Dunno whats wrong tonight, I am getting strange simulation results no matter what I do. The curren tfrom V1 is always 1A, and nothing I do will ever make it change...is there something I need to adjust using these models? circuit as in attached picture, here is the netlist:
XU1 anode gate N001 6sn7 V1 anode 0 250 V2 gate 0 10 R1 N001 0 100 .op .include lib\tubes\6sn7v2.inc .backanno .end ..... and here is the model (include file from above): .subckt 6sn7 P G K Bp P K I=(0.02003791851m)*uramp(V(P,K)*ln(1.0+(0.07740549711)+exp((4.618036737)+(4.618036737)*((2 0.85288965)+(110.4389272m)*V(G,K))*V(G,K)/sqrt((28.13407639)^2+(V(P,K)(7.118597372))^2)))/(4.618036737))^(1.380047579) Cgp G P 4.0pF Cgk G K 2.6pF Cpk P K 0.7pF .ends 6sn7 Any help much appreciated!!
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29th November 2013, 09:09 PM  #93 
diyAudio Moderator

Try transient analysis instead of .op..
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29th November 2013, 09:12 PM  #94 
diyAudio Member
Join Date: Jul 2003
Location: Wayne, West Virginia

@hessner
To use this model in LTSpice, you need to change all the ^ to **. 
29th November 2013, 09:15 PM  #95 
diyAudio Member
Join Date: Jul 2003
Location: Wayne, West Virginia

Code:
.subckt 6sn7 P G K Bp P K I=(0.02003791851m)*uramp(V(P,K)*ln(1.0+(0.07740549711)+exp((4.618036737)+(4.618036737)*((2 0.85288965)+(110.4389272m)*V(G,K))*V(G,K)/sqrt((28.13407639)**2+(V(P,K)(7.118597372))**2)))/(4.618036737))**(1.380047579) Cgp G P 4.0pF Cgk G K 2.6pF Cpk P K 0.7pF .ends 6sn7 
29th November 2013, 10:06 PM  #96 
diyAudio Member
Join Date: Jul 2003
Location: Wayne, West Virginia

Found a space in the model were there shouldn't have been one.
Here's the corrected model: .subckt 6sn7 P G K Bp P K I= + (0.02003791851m)*uramp(V(P,K)*ln(1.0+(0.07740549711)+exp((4.618036737)+ + (4.618036737)*((20.85288965)+(110.4389272m)*V(G,K))*V(G,K)/sqrt((28.13407639)**2+ + (V(P,K)(7.118597372))**2)))/(4.618036737))**(1.380047579) Cgp G P 4.0pF Cgk G K 2.6pF Cpk P K 0.7pF .ends 6sn7 Looks like you may be trying to sim the curves for your 6SN7 model. If so here's the file I did LTSpice using your model. 
30th November 2013, 01:47 AM  #97 
diyAudio Member
Join Date: May 2003

I am looking for LTSpice models for 6H30 and 1626... Found some here, but they do not work with my LTSpice generic TRIODE model obtained from Duncan's Amp Pages.
I am new to LTSpice, so it is not clear at all how I should proceed to get this working. Thank you for any tips you may have! 
30th November 2013, 08:20 AM  #98 
diyAudio Member

many thanks cogsncogs!! Will try later today... In fact I was so desperate I tried another schematic that simulated fine in the past, and it still did  couldnt see the forest for the trees anymore, so many *** and ^^^ .....
again, many thanks! @kevinkr: tried that , no difference. I think it is due to what cogsncogs pointed out. I should have known as I used Ayumi's models before, but I did not remember..... thanks anyway!
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30th November 2013, 04:46 PM  #99 
Official Court Jester
diyAudio Member

Boys
I know , up to some level , how to use LT Spice ..... but I'm ignorant in making models ; is anyone able ( and kind ) enough to make LT Spice model for this tube ? TIA
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30th November 2013, 05:15 PM  #100  
diyAudio Moderator

Quote:
Code:
* * Generic triode model: SRS511_T * Copyright 20032008 by Ayumi Nakabayashi, All rights reserved. * Version 3.10, Generated on Sat Nov 30 19:13:05 2013 * Plate *  Grid *   Cathode *    .SUBCKT SRS511_T A G K BGG GG 0 V=V(G,K)+0.57531149 BM1 M1 0 V=(0.024087858*(URAMP(V(A,K))+1e10))**0.96103099 BM2 M2 0 V=(0.60950066*(URAMP(V(GG)+URAMP(V(A,K))/16.21146)+1e10))**2.461031 BP P 0 V=0.0091192653*(URAMP(V(GG)+URAMP(V(A,K))/26.597937)+1e10)**1.5 BIK IK 0 V=U(V(GG))*V(P)+(1U(V(GG)))*0.0059448485*V(M1)*V(M2) BIG IG 0 V=0.0045596326*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)(0.0050787208*URAMP(V(A,K))**1.5)))+1e10*V(A,K) BIGK G K I=V(IG) * CAPS CGA G A 0.24p CGK G K 23p CAK A K 13p .ENDS 

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