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Spice model for GU50 (LT-Spice)
Spice model for GU50 (LT-Spice)
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Old 3rd October 2013, 10:13 PM   #1
voltagezone is offline voltagezone
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Default Spice model for GU50 (LT-Spice)

I am looking for a spice model for the GU50 for LT-Spice.
Please help.
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Old 4th October 2013, 11:06 AM   #2
euro21 is offline euro21  Hungary
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Spice model for GU50 (LT-Spice)
http://ltwiki.org/files/LTspiceIV/lib/sub/Valves.Lib
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Old 4th October 2013, 12:16 PM   #3
voltagezone is offline voltagezone
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Thank you. In this model G3 is missing. So basically a tetrode is simulated and not a pentode. Does the model work anyway?
.SUBCKT GU50 1 2 3 4 ; P G2 G1 K (Pentode) 21-Nov-2001 X1 1 2 3 4 Tetro MU=73.53 EX=1.150 KG1=194.7 KP=13.28 KG2=4500 + KVB=30.3 VCT=0.00 RGI=2k CCG=14P CPG1=0.1P CCP=9.2P .ENDS
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Old 5th October 2013, 11:58 AM   #4
cogsncogs is offline cogsncogs  United States
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Yes. The model assumes G3 is at 0V with respect to the cathode. Or I should say G3 is tied to the cathode or at 0V.

Last edited by cogsncogs; 5th October 2013 at 12:00 PM.
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Old 5th October 2013, 12:18 PM   #5
voltagezone is offline voltagezone
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I got it working. Results seem good.
Thank you.
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Old 5th October 2013, 03:33 PM   #6
jazbo8 is offline jazbo8
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It works but far from accurate, here is a comparison of the model vs. the datasheet.

An externally hosted image should be here but it is no longer accessible. Please upload images instead of linking to them to prevent this.
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Old 5th October 2013, 11:46 PM   #7
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Quote:
Originally Posted by jazbo8 View Post
It works but far from accurate, here is a comparison of the model vs. the datasheet.

An externally hosted image should be here but it is no longer accessible. Please upload images instead of linking to them to prevent this.

Who cares. GU50 pentode curves are inconsistent anyway.
What to choose?
Attached Images
File Type: jpg GU-50_Ug2=250V.jpg (33.5 KB, 158 views)
File Type: jpg GU-50_Ug2=250V_V2.jpg (71.1 KB, 156 views)
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Old 6th October 2013, 06:35 AM   #8
jazbo8 is offline jazbo8
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Point taken, since in this case we do not know which datasheet the model was based on... BTW, where did the image on the left came from?
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Old 6th October 2013, 11:30 AM   #9
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Quote:
Originally Posted by jazbo8 View Post
... BTW, where did the image on the left came from?
If I remember well, from Wavebourn.
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Old 6th October 2013, 11:45 AM   #10
jazbo8 is offline jazbo8
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Quote:
Originally Posted by RajkoM View Post
If I remember well, from Wavebourn.
Cool, thanks, found it here.

After some sleuthing, I think the SPICE model posted above came from Eugene Karpov with some slight modifications to the parameters.
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