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12B4a spice model.
12B4a spice model.
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Old 24th February 2009, 01:36 PM   #1
ashok is offline ashok
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12B4a spice model.
Default 12B4a spice model.

Does anyone have a spice model for the tube 12b4A ?
A search didn't produce any results on google or this forum.

Thanks.
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Old 24th February 2009, 04:32 PM   #2
revintage is offline revintage
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Something wrong with your Google ?


.subckt 12B4 P G K
Bp P K I=(0.7475666979m)*uramp(V(P,K)*ln(1.0+(-0.03869784353)+exp((5.06748961)+(5.06748961)*((7.7 83573199)+(-7.718521472m)*V(G,K))*V(G,K)/sqrt((16.65965534)**2+(V(P,K)-(1.974437216))**2)))/(5.06748961))**(1.293967904)
.ends 12B4
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Old 25th February 2009, 04:16 AM   #3
ashok is offline ashok
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12B4a spice model.
Thanks Lars.
Nothing wrong with Google I guess , so it must be something wrong with the gray cells in my head !

But surprisingly though it came up with several sites I tried a few and didn't find the Spice data and gave up . Maybe I just tried the wrong ones. Maybe I'm getting too old .
Rgds,
Ashok.
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Old 25th February 2009, 06:25 AM   #4
Cauhtemoc is offline Cauhtemoc  Sweden
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A while back I posted a spice model of the 12B4 based on the work of David Heiser:

http://www.diyaudio.com/forums/showt...hreadid=123880
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Old 25th February 2009, 10:51 AM   #5
revintage is offline revintage
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Checked the Heiser model and it seems to be working OK.

Here is a Ua/Ia sim from LTSpice.
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File Type: png 12b4.png (41.7 KB, 198 views)
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