sensasi: [LTspice] Re: Tube:missing node(s)

Senin, 25 Februari 2008

[LTspice] Re: Tube:missing node(s)

--- In LTspice@yahoogroups.com, "Helmut Sennewald"
<helmutsennewald@...> wrote:
>
> --- In LTspice@yahoogroups.com, "kolophonow" <kolophonow@> wrote:
> >
> > Hi all,
> > I have some trouble with pentode tube models. I tried do
> > get tube models from Tube.lib to work. I will post the
> > libraries and the schematic in the Temp folder. Is there
> > any compassionate soul who can give some help?
> >
> > Thanks T.
> >
>
>
> Hello kolophonow,
>
> Your library file contains subcircuits for pentodes with 4 pins.
> This means your symbol must have 4 pins and not 5 as you have
> used. It's also important that the netlist order of the pins
> in the symbol match the order of the pins in the subcircuit.
>
> .SUBCKT 6AN8P 1 2 3 4 ; P G1 C G2 ; PENTODE SECTION
> ...
> .ENDS
>
> Your model file has a wrong line at the beginning.
> "TUBE LIBRARY"
> If you use ".inc", everything of the file will be included.
> If you would use ".lib", only the models and subcircuits would
> be included. In the ladder case the line "TUBE LIBRARY" wouldn't
> be a problem. I have changed this line to a comment and uploaded
> the file again. Watch the "*" in the first place.
> *TUBE LIBRARY
>
> I have also uploaded a correct pentode symbol with 4 pins and
> the netlist order P, G1, C, G2 as required by the pentode
> models in "tube.lib".
> And last but not least I have made a working example.
>
> Files > Temp > Tube Lib Pentode > Pentode_test1.asc
> Files > Temp > Tube Lib Pentode > xpentode4_p1g1cg2.asy
> Files > Temp > Tube Lib Pentode > tube.lib
>
> Best regards,
> Helmut
>
> PS: This library is from Norman Koren.
>
>
>
> * This library was developed by Norman Koren.
> *
> * For details, refer to the article, "Improved Vacuum-Tube Models
> * for SPICE simulations," Glass Audio, Vol. 8, No. 5, 1996,
> * available from Audio Amateur Corporation, 305 Union St.,
> * PO Box 176, Peterborough, NH 03458 USA. Phone 603-924-9464.
> *
> * All the usual legal disclaimers apply. The author has made
> * every effort to provide correct information, but assumes no
> * liabilities for errors, misuse of the models,
> * or inevitable changes made by users.
> *
> * The author welcomes your comments, stories, and questions
> * (if they don't require too much effort to answer). For really
> * BIG stuff, he will consider consulting for a fee.
> * Please contact Norman Koren by Email at kormar@...
> *
> * Some models are commented out because the evaluation version of
> * Pspice has a maximum of twenty.
>
> .SUBCKT 6550 1 2 3 4 ; P G1 C G2
> + PARAMS: MU=7.9 EX=1.35 KG1=890 KG2=4200 KP=60 KVB=24
> + CCG=14P CPG1=.85P CCP=12P RGI=1K
> RE1 7 0 1MEG ; DUMMY SO NODE 7 HAS 2 CONNECTIONS
> E1 7 0 VALUE= ; E1 BREAKS UP LONG EQUATION FOR G1.
> +{V(4,3)/KP*LOG(1+EXP((1/MU+V(2,3)/V(4,3))*KP))}
> G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1*ATAN(V(1,3)/KVB)}
> G2 4 3 VALUE={(EXP(EX*(LOG((V(4,3)/MU)+V(2,3)))))/KG2}
> * G2 4 3 VALUE={PWR(V(4,3)/MU+V(2,3),EX)/KG2}
> RCP 1 3 1G ; FOR CONVERGENCE
> C1 2 3 {CCG} ; CATHODE-GRID 1
> C2 1 2 {CPG1} ; GRID 1-PLATE
> C3 1 3 {CCP} ; CATHODE-PLATE
> R1 2 5 {RGI} ; FOR GRID CURRENT
> D3 5 3 DX ; FOR GRID CURRENT
> .MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
> .ENDS 6550
>
> ....
>

Helmut, thank you very much. I checked your suggestions and finally it
worked out very well. The problem however was not the symbol of the
pentode. I uploded the wrong .asy file. To correct this I uploded the
pentode symbol file of the 6AN8P which I created. I carefully named
and checked the pins to make the model work.

The key was the wrong head line of the .lib-file. Thank you for
pointing out this. Now the test circuit works with your symbol and
with mine too.

By the way - after having played around with TiNa-Spice and PSpice
later on, I am very happy with SwCADIII. And thank you again for your
quick and efficient help.

Regards, Thomas