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Tube spice models

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#6
Hi Nhuwar,
PM means private message, if you don't see a pm button at the bottom of my post you can email me from my website which is listed in my signature.

Hi Ray,
I have imported models from various places and made a few using curve captor. (There's a thread here, CC works well. A little user unfriendly perhaps.) Triode models seem to be good. I have had less success using paintcc (paint_kip) to make pentode models - they're not very good.
 
#8
Hey Nick,
I think you'll find LTspice quite useful. I can send you a pretty comprehensive tube library for LTSpice, it should save you quite a lot of time and aggrevation.

It's very easy to modify its libraries and add bjts, fets, diodes and the like to the existing libraries.

Results of course are only as good as the models used.

I have made a few pentode models using paintcc and was unable to get a good curve match - the resulting models are pretty poor and I therefore avoid using them. It makes me suspect that most current pentode models out there are not that good either.
 
#9
Great Kevin that sounds excellent.
I'm assuming that you don't have a model for a 813 beam terode though anywas it will be a good lessen for me to create the model to punch it into spice.

If you want you can send me a emial with a attachment I think I have the link turned on
If not let me know

And I'll shut you a email abit latter.

nick
 
#10
kevinkr said:
Hey Nick,
I think you'll find LTspice quite useful. I can send you a pretty comprehensive tube library for LTSpice, it should save you quite a lot of time and aggrevation.

It's very easy to modify its libraries and add bjts, fets, diodes and the like to the existing libraries.

Results of course are only as good as the models used.

I have made a few pentode models using paintcc and was unable to get a good curve match - the resulting models are pretty poor and I therefore avoid using them. It makes me suspect that most current pentode models out there are not that good either.
Click to expand...

Hi kevinkr,

If you haven't done so, already, you might consider putting your tube model library into the files section of the LT-Spice users' group, at http://www.yahoogroups.com .

That group is truly-excellent, for LT-Spice support! And the author of LT-Spice, Mike Englehardt (aka "Panama Mike"), of Linear Technology Corp, is a regular there, too.

There have been requests, there, lately, for tube models. The only good suggestion for existing models, that I saw at the time, was the duncanamps site.

- Tom Gootee

http://www.fullnet.com/~tomg/index.html

-----------------
 
#11
Here are some spice models for various tubes I have recently added to my library, some are probably better than others. I used curve captor to create the models and then subsequently added the most important interelectrode capacitances.

* 71a Model
* Traced by Kevin Kennedy 4.14.07 using Curve Captor
.subckt 71a A G K
Bp A K I=(0.01920353249m)*uramp(V(A,K)*ln(1.0+(-0.5900909656)+exp((4.378369184)+(4.378369184)*((3.075663641)+(-0.4532604061m)*V(G,K))*V(G,K)/sqrt((-1.305099924e-006)**2+(V(A,K)-(4.436434761))**2)))/(4.378369184))**(1.723372081)
*Capacitances
CGK G K 3.2p
CGA G A 7.5p
CAK A K 2.9p
.ends 71a

* 6021 Model
* Curve Captor model
.subckt 6021 A G K
Bp A K I=(0.007237439803e-3)*uramp(V(A,K)*ln(1.0+(0.02398363722)+exp((2.884836093)+(2.884836093)*((42.12840035)+(-332.3837771e-3)*V(G,K))*V(G,K)/sqrt((3.013312381e-006)**2+(V(A,K)-(-10.83109222))**2)))/(2.884836093))**(1.626318011)
*Capacitances
CGK G K 0.7p
CGA G A 1.5p
CAK A K 0.28p
.ends 6021

* 5744 Model
*Traced by Kevin Kennedy 11.21.06 using Curve Captor
.subckt 5744 A G K
Bp A K I=((0.004400033102m)+(0.0005981672849m)*V(G,K))*uramp((53.41879747)*V(G,K)+V(A,K)+(-17.32853498))**1.5 * V(A,K)/(V(A,K)+(-19.03861576))
*Capacitances
CGK G K 3.4p
CGA G A 0.95p
CAK A K 3.0p
.ends 5744

* D3A Triode connected model
*Traced by Kevin Kennedy 12.15.06 using Curve Captor
.subckt D3AT A G K
Bp A K I=(0.01421213952m)*uramp(V(A,K)*ln(1.0+(-0.3656855867)+exp((0.05161803446)+(0.05161803446)*((1347.92881)+(-149831.3787m)*V(G,K))*V(G,K)/sqrt((22.06449306)**2+(V(A,K)-(-9.250221191))**2)))/(0.05161803446))**(1.193961005)
*Capacitances
CGK G K 7.3P
CGA G A 2.7P
CAK A K 3.1P
.ends D3AT

These should be compatible with any spice program that supports 3F4 models and were created specifically for LTspice.

You can copy and paste these directly into your own tube library.

Most, but not all are Koren 8 parameter models, see if you can spot the one that isn't.. 😀

These models are provided without warranty and for personal use only.
 
#12
SPICE Model for the 813 tetrode

I'm also interested in SPICE models for tubes, especially the 813 requested by Nick (nhuwar I think). Other tubes I'd love to have models for include 7591, 5651, 6336, 6U8/6GH8. (I'd like to be able to run simulations on my HH Scott 208 clone).
 
#14
Good luck finding them. Tettrode aren't the norm when it comes to high power audio. Atleast thats what I found out.

If you want you could try curve captor which you can google and download to create your own model. Oh ya just to let you know curve captor uses a scan of the plate characteristics graph to create the model.

Nick
 
#15
nhuwar said:
Good luck finding them. Tettrode aren't the norm when it comes to high power audio. Atleast thats what I found out.

If you want you could try curve captor which you can google and download to create your own model. Oh ya just to let you know curve captor uses a scan of the plate characteristics graph to create the model.

Nick
Click to expand...

Thanks for the tip on curve captor, I'll try it. I have the data sheet.

Anyway, I hope Spice models are not limited to audio 😉 ...

Jan Didden
 
#16
As for spice it's not but I think curve captor is. I take it your application is rf? Theree realy is a use in rf applications for a triode strapped tetrode because the screen grid is kind of needed at high frequencys.

Nick
 
#17
nhuwar said:
As for spice it's not but I think curve captor is. I take it your application is rf? Theree realy is a use in rf applications for a triode strapped tetrode because the screen grid is kind of needed at high frequencys.

Nick
Click to expand...

No, my app is audio. Direct drive for electrostatics, 1500V RMS @ 100mA RMS or somewhere in that ballpark.

I tried to download curve captor but I can only get it to start in DOS prompt mode. Wasn't there supposed to be a GUI front-end? Are you using it?

Jan Didden
 
#18
janneman said:


No, my app is audio. Direct drive for electrostatics, 1500V RMS @ 100mA RMS or somewhere in that ballpark.
Click to expand...

Jan -- Kepco used the 8068 in their HV power supplies, I believe that Keithley used it in the 240 Regulated HV supply -- this tube is harder to find, certainly, than the 4X150 or 4CX250, but I bet there are still some guys at Kepco or Keithley who have abundant data.

I have a bunch of them from 240 power supplies.

There was also an article in Ham Radio Magazine about a curve tracer for HV, High Power tubes. I cited it in my curve tracer article in AX -- if you can't get it PM me.
 
#19
jackinnj said:


Jan -- Kepco used the 8068 in their HV power supplies, I believe that Keithley used it in the 240 Regulated HV supply -- this tube is harder to find, certainly, than the 4X150 or 4CX250, but I bet there are still some guys at Kepco or Keithley who have abundant data.

I have a bunch of them from 240 power supplies.

There was also an article in Ham Radio Magazine about a curve tracer for HV, High Power tubes. I cited it in my curve tracer article in AX -- if you can't get it PM me.
Click to expand...


Hi Jack,

Thanks. I actually have all the material including the tubes and data sheets. I was just trying to find spice models so I could sim the amp before building; at least to weed out my most stupid mistakes 😉

What AX year/issue was that? I have all of them. Do you have a copy of the Ham radio article?

Jan Didden
 
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