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-   -   Vacuum Tube SPICE Models (https://www.diyaudio.com/forums/tubes-valves/243950-vacuum-tube-spice-models.html)

jazbo8 8th July 2014 11:56 AM

I suspect the FFT results are far from real life... too good to be true.:)

nl3prc 8th July 2014 07:38 PM

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Quote:

Originally Posted by padamiecki (https://www.diyaudio.com/forums/tubes-valves/243950-vacuum-tube-spice-models-post3984592.html#post3984592)
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

jazbo8 10th July 2014 03:20 PM

Quote:

Originally Posted by nl3prc (https://www.diyaudio.com/forums/tubes-valves/243950-vacuum-tube-spice-models-post3977202.html#post3977202)
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.:confused:

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nl3prc 11th July 2014 10:56 AM

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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

nl3prc 11th July 2014 11:48 AM

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Here is just another test
Som difference is to be expected

jazbo8 11th July 2014 12:51 PM

Try the tests with Eg2=250V, then you can see Ayumi's model is more accurate than Koren's (which is usually the case).

nl3prc 12th July 2014 01:00 PM

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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

jazbo8 12th July 2014 02:53 PM

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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nl3prc 13th July 2014 11:35 AM

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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.

jazbo8 13th July 2014 03:58 PM

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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