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Vacuum Tube SPICE Models
Vacuum Tube SPICE Models
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Old 8th July 2014, 11:56 AM   #501
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I suspect the FFT results are far from real life... too good to be true.
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Old 8th July 2014, 07:38 PM   #502
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Quote:
Originally Posted by padamiecki View Post
I have standard directives for the simulations and I copied them for simulations, yes cordell-models.txt is not necessary.
20kHz is for the same reasons, you can easy change it to any frequency you want.
30Hz sim is not bad too.
My setup would be something like below
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File Type: jpg Push-and-Pull-EL12-AMP-Class-AB-005.JPG (120.8 KB, 427 views)
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Old 10th July 2014, 03:20 PM   #503
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Quote:
Originally Posted by nl3prc View Post
I tied to simulate with the Ayumi model but this is not workin
I changed the ^ into ** but no luck
I made a model according to Koren models and this seems to work
Ayumi's model works fine in LTSpice... while the EL12 Koren model you posted seems to deviate from the datasheet quite a bit.

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Old 11th July 2014, 10:56 AM   #504
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MM i tested both of them and this is the result
Is there something wrong with these tests

they look the same to me
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File Type: jpg Koren-VS-Ayumi-model-001.JPG (177.9 KB, 308 views)
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File Type: zip Koren-VS-Ayumi-model-001.zip (2.8 KB, 28 views)
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Old 11th July 2014, 11:48 AM   #505
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Here is just another test
Som difference is to be expected
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File Type: zip Koren-VS-Ayumi-model-002.zip (2.8 KB, 27 views)
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Old 11th July 2014, 12:51 PM   #506
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Try the tests with Eg2=250V, then you can see Ayumi's model is more accurate than Koren's (which is usually the case).
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Old 12th July 2014, 01:00 PM   #507
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I just made a change in the model
but i found that the Ayumi model takes around 4 minuts to simulate and the norman about 15 sec.

However the result is the same with my somewhat changed model
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Old 12th July 2014, 02:53 PM   #508
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I'm sorry but it is still quite a bit off from the datasheet (particularly the upper traces), for comparison Koren's model on the left and Ayumi's model on the right:

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Old 13th July 2014, 11:35 AM   #509
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I think that this is also the case with different manufactures of tubes
A Philips wil be different than a RCA

I dit found out somthing else when you look at the G2 they react different
while the Norman models react liniar the Ayumi is not.
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File Type: jpg el12-test-norman-Ayumi-004-a.JPG (189.7 KB, 78 views)
File Type: jpg el12-test-norman-Ayumi-004-b.JPG (193.0 KB, 77 views)
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File Type: zip el12-test-norman-Ayumi-004.zip (5.4 KB, 20 views)
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Old 13th July 2014, 03:58 PM   #510
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Sorry to sound like a broken record, but the screen current is poorly modeled using the Koren method. It could be improved, please refer to Dr. Gurskii's article in AA (just a bit better) or Dr. Reefman's improved methodology (great improvement), which requires the uTracer to really take advantage of it.
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