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21st March 2014, 05:30 PM  #401 
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25th March 2014, 11:58 PM  #402 
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Join Date: May 2011
Location: Virginia

WE437A?
A spice model compatible with Tina would be nice for this tube. Thanks.
I guess it's the same as the 6S45P?
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26th March 2014, 12:42 AM  #403 
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Join Date: May 2003
Location: USA

Very similar... 6C45 has slightly higher plate dissipation (7.8W), slightly higher gain (~52), but lower maximum plate voltage (150V).

26th March 2014, 12:46 AM  #404 
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Join Date: May 2011
Location: Virginia

OK, thanks.
On another tube, I'm having real difficulty finding a tetrode model of a D3A. Can someone direct me to a link or something? thanks.
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26th March 2014, 04:48 AM  #405  
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Join Date: Jul 2003
Location: Wayne, West Virginia

Quote:
Code:
* Plate *  Screen Grid *   Grid *    Cathode *     .SUBCKT D3a A S G K ; old model Eat at 0 VALUE={.636*ATAN(V(A,K)/20)} ; /# is sharpness of knee Egsg gsg 0 VALUE={LIMIT(V(S,K)/1+PWRS(V(G,K),1)/.0146+V(A,K)/80000,0,1E6)} ; s,k/#=peak current g,k/# is mu a,k/# is plate res Egss gss 0 VALUE={LIMIT(V(S,K)/10000000000+PWRS(V(G,K),1.0)/.03+V(A,K)/80,0,1E6)} ; separating gsg,gss allows cutoff to be different Egs2 gs2 0 VALUE={PWRS(V(gsg),1.45)} Egs3 gs3 0 VALUE={PWRS(V(gss),1.45)} Ecath cc 0 VALUE={V(gs2)*V(at)+V(gs3)*V(at)} Ga A K VALUE={5.4E5*V(cc)} Escrn sc 0 VALUE={V(gs2)*(1.1V(at))} Gs S K VALUE={5.0E5*V(sc)*LIMIT(V(S,K),0,10)/10} Gg G K VALUE={PWR(LIMIT(V(G,K)+1,0,1E6),1.5)*(1.25V(at))*450E6} Cg1 G K 8.5p Cak A K 6.5p Cg1a G A 1.1p .ENDS D3a Code:
* Plate *  Screen Grid *   Grid *    Cathode *     .SUBCKT 7721/D3a A S G K Ea Gi G value= {.09} ; grid offset Eat at 0 VALUE={.636*ATAN(V(A,K)/15)} ; /# is sharpness of knee Egsg gsg 0 VALUE={LIMIT(V(S,K)/1+PWRS(V(G,K),1)/.014+V(A,K)/80000,0,1E6)} ; s,k/#=peak current g,k/# is mu a,k/# is plate res mu was too low Egss gss 0 VALUE={LIMIT(V(S,K)/10000000000+PWRS(V(G,K),1.0)/.03+V(A,K)/80,0,1E6)} ; separating gsg,gss allows cutoff to be different Egs2 gs2 0 VALUE={PWRS(V(gsg),1.4)} Egs3 gs3 0 VALUE={PWRS(V(gss),1.4)} Ecath cc 0 VALUE={V(gs2)*V(at)+V(gs3)*V(at)} Ga A K VALUE={limit(6.4E5*V(cc),0,v(a,k)/1.2k)} ; added knee limit 31710 sb Escrn sc 0 VALUE={V(gs2)*(1.1V(at))} Gs S K VALUE={limit(9.8E5*V(sc)*LIMIT(V(S,K),0,10)/10,0,v(a,k)/800)} ; screen current was too low, added limit sb Gg G K VALUE={PWR(LIMIT(V(G,K)+1,0,1E6),1.5)*(1.25V(at))*450E6} Cg1 G K 9.5p Cak A K 4.5p Cg1a G A 0.04p .ENDS D3a 

26th March 2014, 04:51 AM  #406 
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Join Date: Jul 2003
Location: Wayne, West Virginia

I got them from here:
Intactaudio 
26th March 2014, 05:07 AM  #407  
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Join Date: Jul 2003
Location: Wayne, West Virginia

Quote:
Code:
* 437A  IDH miniature hightransconductance triode * Gp P K VALUE={(m)*limit(()*V(G,K)+V(P,K),0.0,1.0e16)^1.5} * From WE 437A datasheet  traced on 240302 by AF .subckt 437A P G K Cgp G P 3.8p Ci G K 11.1p Co P K 1.0p * Modified Koren model (8 parameters): mean fit error 1.94219 mA Gp P K VALUE= + {(0.04402840226m)*limit(V(P,K)*log(1.0+(0.3253203784)+exp((2.359465245)+ + (2.359465245)*((38.12689842)+(2617.293976m)*V(G,K))*V(G,K)/sqrt((54.35117386)^2+ + (V(P,K)(41.98740594))^2)))/(2.359465245),0.0,1.0e16)^(1.633336782)} .ends 437A 

26th March 2014, 01:49 PM  #408 
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Join Date: May 2011
Location: Virginia

Thanks a bunch! You guys are very helpful!
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29th March 2014, 04:10 PM  #409  
diyAudio Member

Quote:


2nd April 2014, 12:41 PM  #410 
diyAudio Member
Join Date: Feb 2010

I would be interested in having 6p36s LTspice model.
This tube seems to differ from EL500/504 a bit. 
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