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Vacuum Tube SPICE Models
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Old 25th July 2021, 04:38 AM   #3001
Koonw is offline Koonw
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Join Date: Apr 2013
"Ix(U1:Plate)" trace is not limited in your plot, try to use same Limit range in all expressions. Say if Limit(140m, ... , 0) then use same range for any other added expression.

Which bracket do you use: [] or ()? I use (). It appears to me you have a space in Limit function: Limit(1 30m, ...., 0)? You can paste the expression here if you wish.

No need to include "Ix(U1:Plate)" in all expressions of the trace plots other than the "Ix(U1:Plate)" plot itself. I can plot one myself later to confirm you try again.

Last edited by Koonw; 25th July 2021 at 04:53 AM.
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Old 25th July 2021, 05:17 AM   #3002
Koonw is offline Koonw
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You have plotted the same trace "Ix(U1:Plate)" twice, one with and one without Limit, remove the one without the Limit..
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Old 25th July 2021, 08:39 PM   #3003
dgta is offline dgta  United States
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Koonw, did you (or anyone else) try the 6AG7_GE model in post 2532 in LTSpice? I get a missing node error. Thx
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Old 25th July 2021, 10:14 PM   #3004
Koonw is offline Koonw
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I tried 6AG7_GE is fine. You probably have one or more unknown spice directive, maybe you mislabel a net name as spice directive?
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Old 25th July 2021, 11:15 PM   #3005
dgta is offline dgta  United States
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This is the simple circuit. Do you see anything wrong?
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File Type: asc 6AG7test.asc (2.1 KB, 13 views)
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Old 25th July 2021, 11:28 PM   #3006
Koonw is offline Koonw
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I added this spice directives it works.

.options GminSteps=0
.options NoOpIter
.options SrcSteps=100
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Old 25th July 2021, 11:43 PM   #3007
dgta is offline dgta  United States
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Still doesn't work for me. Here is the screen shot with the added directives.

I was running the same basic circuit with the same exact directives today with several other tubes, no problem at all. It only refused to run with 6AG7_GE.
Is the model correct for LTSpice as posted or is it for PSpice?
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File Type: jpg Screenshot 2021-07-25 193705.jpg (191.8 KB, 109 views)
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Old 26th July 2021, 02:35 AM   #3008
Koonw is offline Koonw
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Try if any problem with the copy from me. The error message appears unrelated to the model.
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File Type: png 6AG7test plot-1.png (97.1 KB, 104 views)
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File Type: asc 6AG7test-1.asc (4.9 KB, 7 views)
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Old 26th July 2021, 04:56 AM   #3009
dgta is offline dgta  United States
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Thanks. It was the model indeed. It took me a while to figure it out but something got corrupted when I copied the model from post #2532. I don't know what or how it happened, but I re-copied it and it works fine now. It looked the same, I didn't go through it letter by letter. I must have accidentally touched a keyboard key while cut-and-pasting it. I appreciate your help.
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Old 26th July 2021, 04:34 PM   #3010
Koonw is offline Koonw
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Quote:
Originally Posted by EL8 View Post
intersting, the Y axis changed to mV

Oh I realise we need to be more specific about the exact unit. 11mA is more exact instead of 11m which it treated as 11mV, so it should be as below:

Limit(11mA,(263V-V1)/24.812K,0)
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