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Triode/Pentode Loadline Calculator
Triode/Pentode Loadline Calculator
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Old 21st August 2014, 01:58 PM   #1
gsmok is offline gsmok  Poland
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Default Triode/Pentode Loadline Calculator

Hi
I'm working on a program to simulate loadlines. Here's a link to the first version:

Triode Loadline Simulator v.0.2

The list of tubes is constantly updated. This is a simple javascript, so the program can be run without any installation and can be run by most web browsers. To change the parameters (operating point etc.) use triangular indicators that can be dragged using the mouse.

I checked the behavior of the program using different browsers. There is no problem with new versions of browsers. Unfortunately, Internet Explorer version 8.0 and earlier can not cope with it. In a newer version of IE for example. 11.0 this problem does not occur.
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Old 21st August 2014, 04:56 PM   #2
kASD is offline kASD
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Very nice work...!!!

Add 4P1L also to the list...
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Old 21st August 2014, 07:01 PM   #3
gsmok is offline gsmok  Poland
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But as I know the 4P1L is a pentode, not a triode.
I am just in the process of writing program to simulate pentodes.
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Last edited by gsmok; 21st August 2014 at 07:09 PM.
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Old 22nd August 2014, 04:23 AM   #4
pageboy is offline pageboy  United States
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Great idea! Definitely needs a lot more tube curves, or else a way to input your own.
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Old 22nd August 2014, 06:56 AM   #5
gsmok is offline gsmok  Poland
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Thank you for your interest in the subject.
The simulations are carried out on the basis of the Koren's model - the same as often used in Spice modeling.

Improved vacuum tube models for SPICE, Part 1

So the program can simulate any triode provided that its parameters (five values: mu, ex, kp, kg1, kvb) are known.
According to your suggestion, after testing phase I will add the ability to specify parameters of any triode by the user. I hope I will do it in few days.
In the meantime I will be adding new models. I calculate Koren's parameters using anode characteristics and javascript program implementing genetic algorithm.
I will be grateful for any comments on whether the characteristics are well matched
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Old 22nd August 2014, 07:01 AM   #6
tubetvr is offline tubetvr
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Nice work!

Last edited by tubetvr; 22nd August 2014 at 07:03 AM. Reason: Answer already provided
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Old 22nd August 2014, 08:56 AM   #7
esltransformer is offline esltransformer  Georgia
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why is the HV limited? For instance a 300B, not more then 660V.
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Old 22nd August 2014, 09:23 AM   #8
pageboy is offline pageboy  United States
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Quote:
Originally Posted by gsmok View Post
So the program can simulate any triode provided that its parameters (five values: mu, ex, kp, kg1, kvb) are known. According to your suggestion, after testing phase I will add the ability to specify parameters of any triode by the user. I hope I will do it in few days.
I'm a patient man. I can wait. But thanks for the effort.
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Old 22nd August 2014, 10:09 AM   #9
gsmok is offline gsmok  Poland
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Quote:
Originally Posted by esltransformer View Post
why is the HV limited? For instance a 300B, not more then 660V.
I chose this value arbitrarily. In fact, the program does not have the limitations of the maximum anode voltage but higher maximum value ​​causes that the graph is less detailed.

It might be worth to parameterize these values.
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Old 22nd August 2014, 11:11 AM   #10
gsmok is offline gsmok  Poland
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I increased Vamax for 300B to 720V.
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