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27th March 2008, 03:34 AM  #1 
diyAudio Member

SPICE model for 6AK5 wanted!
Hi,
I need a Berkeley SPICE 3f4 compatible model for 6AK5 pentode or equivalents (EF95  European, 6J1P  Russian, 6F32  "TESLA"). Thank you! 
1st April 2008, 11:39 PM  #2 
diyAudio Member
Join Date: May 2005
Location: Stittsville, Ontario, Canada

Here is a model for 6AK5 that I have developed. The data I have does not include control grid current, so the model is not accurate in that respect. Also, I dont know if this is 3F4 compatible or not, I have forgotten all the conversions. It works with LTSpice. If it is not 3F4 compatible, then some day I will do a translation, but not today.
******************* * * Pentode model based on my investigations * see Excel spreadsheets BeamDLPentode.xls * * * this model therefore uses Korens method for total current, and diode lines. * * similart to Pentode1, but with revised Capture Ratio formula * * R McLean 1 Apr 2008 * * ************************ .Subckt 6AK5 A S G K + Params: Ex=1.919796584 Mug=28.62765031 Mus=5.93E+02 Kg1=1241.263033 Kp=87.71075724 + Kvb=0.001045715 Go=0.174882604 Kd=5.00E02 Exd=1.018581504 Exsd=1.106610165 + C1= 20.45944113 A1=0.001923837 B1=20.33820425 X1=0.011665792 Y1= 0.000268033 Sr=0.032709138 + Cgk=4P Cgs=.5P Cga=0.03P Cak=2.8P * calculate the total space current based on Koren's triode equations, * but with an equivalent triode plate volatage equal to the pentode Vs + Vp/Mus En1 n1 0 VALUE={(V(A,K)/Mus+V(S,K))/Kp*LN(1+EXP(Kp*(1/Mug+(V(G,K)Go)/SQRT(Kvb+(V(A,K)/Mus+V(S,K))**2))))} Esc sc 0 VALUE={ (PWR(V(n1),Ex)+PWRS(V(n1), Ex))/(Kg1) } * calculate the plate current capture ratio Ecr cr 0 Value={If(V(A,K)<=0,0,C1+A1*V(A,K)+B1*((limit(V(A, G),1,1e6)**X1)/(limit(V(S,G),1,1e6)**Y1)))} * the tentative plate current is total space current multiplied by capture ratio Ept pt 0 Value={V(sc)*V(cr)} * calculate the diode line current Ed d 0 value={Kd*V(A,K)**Exd*V(S,K)**Exsd} * the actual Plate current is the lesser of pt and d Ep p 0 value={Min(V(d),V(pt))} Ga A K value={V(p)} * calculate the screen current capture ratio * if Vg <= 0 then the screen gets all the remaining current, otherwise the grid gets some Escr scr 0 value={Limit(if(V(G,K)>0,1Sr*V(G,K),1),0,1)} * screen current is anything not captured by the plate, multiplied by screen capture ratio Esg sg 0 value={(V(sc)V(p))*V(scr)} Gs S K value={V(sg)} * grid current is anything not captured by the plate or the screen Gg G K value={V(sc)v(p)V(sg)} * interelectrode capacitances C1 G K {Cgk} C2 G S {Cgs} C3 G A {Cga} C4 A K {Cak} .ENDS 6AK5
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Robert McLean 
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