I manage to simulate these Ayumi spice models for 47 tube.
It was a bit hard to get trough LT spice MAC OSX version... 🙁
Where to put sybols files, where to put spice model files, how to remark inside lines of symbols to accept spice models, etc..
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I will explain later, in details HOW-TO for potential LTspice mac osx users to not spent whole afternoon in vain...
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The models are not bad, but not so accurate against 47 General electric graph.
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Problem is that i think that only one graph of anode chrs are existing in all datas... 🙁
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Last edited:
spice model for 47 pentode (with tools soft)
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Code:
**** 47_pentode ******************************************
* Created on 04/26/2025 17:19 using paint_kip.jar
* www.dmitrynizh.com/tubeparams_image.htm
* Plate Curves image file: 47 pentode chrs
* Data source link: 47 General Electric datas
* Model made by @Zoran DIY Audio member
*----------------------------------------------------------------------------------
* .SUBCKT 47_pentode P G2 G K ; LTSpice tetrode.asy pinout
.SUBCKT 47_pentode P G K G2 ; Koren Pentode Pspice pinout
+ PARAMS:
+ MU=8.62
+ KG1=2555.3
+ KP=67
+ KVB=12
+ VCT=0
+ EX=1.34
+ KG2=4200
+ KNEE=10.98
+ KVC=2.57
+ KLAM=3.96E-7
+ KLAMG=2.925E-5
+ KD=0.8335
+ KC=0.07392
+ KR1=1.267E-4
+ KR2=0.1691
+ KVBG=0.01219
+ KB1=1.96
+ KB2=1.511
+ KB3=1.89
+ KB4=0.4739
+ KVBGI=0.001
+ KNK=-0.00966
+ KNG=0.00325
+ KNPL=3.03
+ KNSL=0.2992
+ KNPR=123.55
+ KNSR=31.32
+ CCG=8.6P
+ CGP=1.2P
+ CCP=13P
+ RGI=2000.0
*----------------------------------------------------------------------------------
* Vp_MAX=500 Ip_MAX=100 Vg_step=4 Vg_start=0 Vg_count=9
* X_MIN=76 Y_MIN=42 X_SIZE=748 Y_SIZE=600 FSZ_X=1620 FSZ_Y=813 XYGrid=true
* Rp=7000 Vg_ac=15.3 P_max=8 Vg_qui=-15.3 Vp_qui=250
* showLoadLine=y showIp=y isDHP=n isPP=n isAsymPP=n isUL=n showDissipLimit=y
* showIg1=n isInputSnapped=n addLocalNFB=n
* XYProjections=y harmonicPlot=y dissipPlot=y
* UL=0.43 EG2=250 gridLevel2=n addKink=y isTanhKnee=n advSigmoid=y
*----------------------------------------------------------------------------------
RE1 7 0 1G ; DUMMY SO NODE 7 HAS 2 CONNECTIONS
E1 7 0 VALUE= ; E1 BREAKS UP LONG EQUATION FOR G1.
+{V(G2,K)/KP*LOG(1+EXP((1/MU+(VCT+V(G,K))/SQRT(KVB+V(G2,K)*V(G2,K)))*KP))}
RE2 6 0 1G ; DUMMY SO NODE 6 HAS 2 CONNECTIONS
E2 6 0 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))} ; Kg1 times KIT current
E4 8 0 VALUE={V(P,K)/KNEE/(KVBGI+V(6)*KVBG)}
E5 81 0 VALUE={PWR(V(8),KB1)}
E6 82 0 VALUE={PWR(V(8),KB2)}
E7 83 0 VALUE={PWR(V(8),KB3)}
E8 9 0 VALUE={PWR(1-EXP(-V(81)*(KC+KR1*V(82))/(KD+KR2*V(83))),KB4)*1.5708}
RE4 8 0 1
RE5 81 0 1
RE6 82 0 1
RE7 83 0 1
RE8 9 0 1
RE21 21 0 1
E21 21 0 VALUE={V(6)/KG1*V(9)} ; Ip with knee but no slope and no kink
RE22 22 0 1 ; E22: kink curr deviation for plate
E22 22 0 VALUE={V(21)*LIMIT(KNK-V(G,K)*KNG,0,0.3)*(-ATAN((V(P,K)-KNPL)/KNSL)+ATAN((V(P,K)-KNPR)/KNSR))}
G1 P K VALUE={V(21)*(1+KLAMG*V(P,K))+KLAM*V(P,K) + V(22)}
G2 G2 K VALUE={V(6)/KG2*(KVC-V(9))/(1+KLAMG*V(P,K)) - V(22)}
RCP P K 1G ; FOR CONVERGENCE
C1 K G {CCG} ; CATHODE-GRID 1
C2 G P {CGP} ; GRID 1-PLATE
C3 K P {CCP} ; CATHODE-PLATE
R1 G 5 {RGI} ; FOR GRID CURRENT
D3 5 K DX ; FOR GRID CURRENT }
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N)
.ENDS 47_pentode
*$