Does anyone know of an LTSpice model for 12B4? - diyAudio
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Old 28th May 2008, 05:28 AM   #1
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Default Does anyone know of an LTSpice model for 12B4?

It looks like an interesting tube.
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Old 28th May 2008, 07:55 AM   #2
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A guy named David Heiser has written an article on modeling tubes using Koren's models. You can read about it here:

http://www.daheiser.info/VTT/TEXT/va...0equations.pdf

On page 24 he mentions the 12B4, and how he had problems modeling it correctly. Nonetheless, here is a spice model based on the values he presented:

Quote:
.SUBCKT 12B4 1 2 3 ; P G C; NEW MODEL
+ PARAMS: MU=7.5 EX=1.23 KG1=290 KP=48 KVB=280 RGI=1000
+ CCG=5.5P CGP=5.5P CCP=2.0P ; ADD .7PF TO ADJACENT PINS; .5 TO OTHERS.
E1 7 0 VALUE=
+{V(1,3)/KP*LOG(1+EXP(KP*(1/MU+V(2,3)/SQRT(KVB+V(1,3)*V(1,3)))))}
RE1 7 0 1G
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1}
RCP 1 3 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER
C1 2 3 {CCG} ; CATHODE-GRID; WAS 1.6P
C2 2 1 {CGP} ; GRID-PLATE; WAS 1.5P
C3 1 3 {CCP} ; CATHODE-PLATE; WAS 0.5P
D3 5 3 DX ; FOR GRID CURRENT
R1 2 5 {RGI} ; FOR GRID CURRENT
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS
It is a PSpice model, so it should work LTspice as well.
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Old 28th May 2008, 09:12 AM   #3
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Thanks very much for that info.
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