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Vacuum Tube SPICE Models

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#1,861
Koonw said:
Found triode mode of 6L6 surprisingly closed to 6p3p
Click to expand...
That's to be expected - it's just a substitute for the 6L6,

Screenshot - 12_9_2018 , 7_32_08 AM.png
 
#1,864
Hi rankot
Thanks for your feedback. I develop my models manually, that means plotting the curves with LTspice while overlaying a semitransparent diagram, from measured data or data sheet curves. I also have a excel sheet and the solver add-on for least mean square fit of the params, but it is not stable (why ever).
The PCF201 is a very difficult tube to model, because it's a remote cut off. The only approach I know that satisfies such behavior is from Derk Reefman (look at dos4ever.com).

kind regards, Adrian
 
#1,866
Adrian Immler said:
Hi rankot
I also have a excel sheet and the solver add-on for least mean square fit of the params, but it is not stable (why ever).
Click to expand...

Adrian:

With "Solver" try using "log squashed error" -- a trick I got from Nutonian:
=LN(1+ABS(Actual_current - Predicted_Current))
for instance Log squashed error =LN(1+ABS(V16-T16))


It's also important to paramaterize the params to reasonable values.

Unhappily, Nutonian was acquired and they no longer seem to support Eurequa's small license holders.
 
#1,873
1j24b spice model request for smallest russian submini tube

1Ж24Б aka 1j24b aka 1zh24b aka 1sh24b smallest russian submini tube
Maybe better luck this time ?
Here is both pentode and triode curve measurement for spice model.
Thank you in advance ...
 

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  • 1j24b_Pentode.png
    1j24b_Pentode.png
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  • 1j24b_Trioded.png
    1j24b_Trioded.png
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#1,874
rufus74pz said:
On the characteristics of tube 813 screen as anode axis X-Volt, Y-mA anode
Click to expand...
Do you mean triode-connected? i.e., the screen is connected to the anode?

Sorento said:
1Ж24Б aka 1j24b aka 1zh24b aka 1sh24b smallest russian submini tube
Maybe better luck this time ?
Click to expand...
Unfortunately, the model created by the Ayumi method using the traced triode curves does not match up to either to the traced pentode curves or to the datasheet. Perhaps you can trace it again but with higher voltage like those shown in the datasheets?
 
#1,879
Sorento said:
1Ж24Б aka 1j24b aka 1zh24b aka 1sh24b smallest russian submini tube
Maybe better luck this time ?
Here is both pentode and triode curve measurement for spice model.
Thank you in advance ...
Click to expand...
Hi, I want to model but I ran into difficulty: the tube is cut off about 5V, and about 10V for triode. In other word the curve origin is quite a distance from 0, 0 as compared with other sharp cut off tube. I wonder whether it is due to tracer or actually is like that?
 
Last edited:
#1,880
Ok, found original Pentode curve: ''GSTube.com''. Tubes, sockets etc. Parameters and characteristics 1Zh24b

Here is the model, fill in the capacitances:
Code: 
* [URL="http://www.dmitrynizh.com/tubeparams_image.htm"]Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively[/URL]
* Plate Curves image file: 1z24b.gif
* Data source link: <plate curves URL>
*----------------------------------------------------------------------------------
.SUBCKT 1Z24B P G2 G K ; LTSpice tetrode.asy pinout
* .SUBCKT 1Z24B P G K G2 ; Koren Pentode Pspice pinout
+ PARAMS: MU=20 KG1=23159.88 KP=574.32 KVB=26.78 VCT=0 EX=2.149 KG2=18871.78 KNEE=2.891 KVC=1.688
+ KLAMG=6.389E-4   KNK=-0.044 KNG=0.006 KNPL=50 KNSL=11 KNPR=120 KNSR=29
+ CCG=1P CGP=1P CCP=1P RGI=2000.0
* Vp_MAX=80 Ip_MAX=1.8 Vg_step=1 Vg_start=1 Vg_count=9
* X_MIN=70 Y_MIN=22 X_SIZE=734 Y_SIZE=736 FSZ_X=1550 FSZ_Y=878 XYGrid=false
* Rp=1400 Vg_ac=20 P_max=0.0495 Vg_qui=-3 Vp_qui=300 
* showLoadLine=n showIp=y isDHP=n isPP=n isAsymPP=n isUL=n showDissipLimit=n 
* showIg1=n isInputSnapped=y addLocalNFB=n
* XYProjections=n harmonicPlot=y dissipPlot=n 
* UL=0.43 EG2=45 gridLevel2=n addKink=y isTanhKnee=n advSigmoid=n 
*----------------------------------------------------------------------------------
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
RE21 21 0 1
E21  21 0 VALUE={V(6)/KG1*ATAN(V(P,K)/KNEE)} ; 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)) + V(22)}
* Alexander Gurskii screen current, see audioXpress 2/2011, with slope and kink added
RE43 43 K 1G ; Dummy
E43  43 G2 VALUE={0} ; Dummy
G2   43 K  VALUE={V(6)/KG2*(KVC-ATAN(V(P,K)/KNEE))/(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
*$
 
 
* The following triode model is derived from pentode model, see above.
* In the triode model, all spice parameters come directly from the pentode model, except for Kg1,
* which for triode-strapped pentodes is derived from pentode's Kg1, Kg2 and Kvc as
*
*    4Kg1Kg2 / ((2Kvc-Pi)(2Kg1+PiKg2))
 
**** 1Z24B ******************************************
* Created on 12/24/2018 22:49 using paint_kit.jar 4.7 
* [URL="http://www.dmitrynizh.com/tubeparams_image.htm"]Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively[/URL]
* Plate Curves image file: 1z24b.gif
* Data source link: <plate curves URL>
*----------------------------------------------------------------------------------
.SUBCKT TRIODE_1Z24B 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=1P  CGP=1P CCP=1P RGI=2000
+ MU=20 KG1=70624.82 KP=574.32 KVB=26.78 VCT=0 EX=2.149 
* Vp_MAX=80 Ip_MAX=1.8 Vg_step=1 Vg_start=1 Vg_count=9
* Rp=1400 Vg_ac=20 P_max=0.0495 Vg_qui=-3 Vp_qui=300
* X_MIN=70 Y_MIN=22 X_SIZE=734 Y_SIZE=736 FSZ_X=1550 FSZ_Y=878 XYGrid=false
* showLoadLine=n showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=n 
* showIg1=n gridLevel2=n isInputSnapped=y  
* XYProjections=n harmonicPlot=y 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 
*$
 

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  • 1z24b.gif
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  • 1z24b pentode plot.png
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  • 1z24b triode plot compare.png
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  • 1z24b paint-1.png
    1z24b paint-1.png
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