**** 12B_AC ******************************************
* Created on 06/04/2024 00:03 using paint_kit.jar 3.1 
* www.dmitrynizh.com/tubeparams_image.htm
* by: jac van de Walle
* Plate Curves image file: 12B-AC.gif
* Data source link: www.emissionlabs.com/datasheets/12B-AC-D318.pdf
*----------------------------------------------------------------------------------
.SUBCKT TRIODE_12B_AC 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=3P  CGP=1.4P CCP=1.9P RGI=2000
+ MU=14.7 KG1=1620 KP=228 KVB=3600 VCT=-0.973 EX=1.484 
* Vp_MAX=700 Ip_MAX=100 Vg_step=3.5 Vg_start=0 Vg_count=11
* Rp=4000 Vg_ac=55 P_max=40 Vg_qui=-48 Vp_qui=300
* X_MIN=48 Y_MIN=7 X_SIZE=728 Y_SIZE=584 FSZ_X=1326 FSZ_Y=665 XYGrid=false
* showLoadLine=n showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=y 
* showIg1=n gridLevel2=n isInputSnapped=n  
* XYProjections=n harmonicPlot=n dissipPlot=n 
*----------------------------------------------------------------------------------
E1 7 0 VALUE={V(1,3)/KP*LOG(1+EXP(KP*(1/MU+(VCT+V(2,3))/SQRT(KVB+V(1,3)*V(1,3)))))} 
RE1 7 0 1G  ; TO AVOID FLOATING NODES
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1} 
RCP 1 3 1G   ; TO AVOID FLOATING NODES
C1 2 3 {CCG} ; CATHODE-GRID 
C2 2 1 {CGP} ; GRID=PLATE 
C3 1 3 {CCP} ; CATHODE-PLATE 
D3 5 3 DX ; POSITIVE GRID CURRENT 
R1 2 5 {RGI} ; POSITIVE GRID CURRENT 
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N) 
.ENDS 
*$