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Old 15th April 2007, 11:50 PM   #11
kevinkr is offline kevinkr  United States
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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.
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Old 9th November 2007, 04:57 PM   #12
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Smile 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).
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Old 17th January 2008, 01:06 PM   #13
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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
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Old 17th January 2008, 06:31 PM   #14
nhuwar is offline nhuwar  United States
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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
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Old 17th January 2008, 06:41 PM   #15
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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
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Old 17th January 2008, 07:25 PM   #16
nhuwar is offline nhuwar  United States
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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
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Old 19th January 2008, 01:29 PM   #17
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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
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Old 19th January 2008, 02:13 PM   #18
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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.
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Old 19th January 2008, 02:27 PM   #19
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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
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Old 19th January 2008, 03:28 PM   #20
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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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