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 15th April 2007, 10:50 PM #11 kevinkr   diyAudio Moderator     Join Date: Sep 2004 Location: Boston, Massachusetts 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((2.8848 36093)+(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))*ur amp((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. __________________ "To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
 9th November 2007, 03:57 PM #12 RickRigby   diyAudio Member   Join Date: Aug 2007 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).
 17th January 2008, 12:06 PM #13 jan.didden   diyAudio Member     Join Date: May 2002 Location: The great city of Turnhout, BE Hi, I am looking for tube spice modesl for a couple of radial beam power tetrodes, no luck so far. Anybody can help me: 4X150A / 7034 (Eimac probably) 8072 (RCA probably) TIA, Jan Didden __________________ Music is dither to the brain; lets me think below the usual chaos - me Linear Audio Vol 13 is out! Check out my Autoranger and SilentSwitcher
 17th January 2008, 05:31 PM #14 nhuwar   diyAudio Member     Join Date: Jan 2007 Location: Cypress Texas 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
jan.didden
diyAudio Member

Join Date: May 2002
Location: The great city of Turnhout, BE
Quote:
 Originally posted by nhuwar 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
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
__________________
Music is dither to the brain; lets me think below the usual chaos - me
Linear Audio Vol 13 is out! Check out my Autoranger and SilentSwitcher

 17th January 2008, 06:25 PM #16 nhuwar   diyAudio Member     Join Date: Jan 2007 Location: Cypress Texas 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
jan.didden
diyAudio Member

Join Date: May 2002
Location: The great city of Turnhout, BE
Quote:
 Originally posted by nhuwar 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
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
__________________
Music is dither to the brain; lets me think below the usual chaos - me
Linear Audio Vol 13 is out! Check out my Autoranger and SilentSwitcher

jackinnj
diyAudio Member

Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Quote:
 Originally posted by janneman No, my app is audio. Direct drive for electrostatics, 1500V RMS @ 100mA RMS or somewhere in that ballpark.
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.

jan.didden
diyAudio Member

Join Date: May 2002
Location: The great city of Turnhout, BE
Quote:
 Originally posted by jackinnj 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.

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
__________________
Music is dither to the brain; lets me think below the usual chaos - me
Linear Audio Vol 13 is out! Check out my Autoranger and SilentSwitcher

Cauhtemoc
diyAudio Member

Join Date: Jun 2007
Quote:
 Originally posted by janneman 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?
It is written in Tcl, so the actual program is the .tcl file. You need an interpreter to run these files. One example is ActiveTcl, which is freely availible from ActiveState.

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