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Vacuum Tube SPICE Models
Vacuum Tube SPICE Models
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Old 11th June 2018, 05:15 AM   #1691
Trajan is offline Trajan  United States
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Just make your own. Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively You'd be shocked how many canned models are wrong.
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Old 11th June 2018, 05:30 AM   #1692
dch53 is offline dch53  Australia
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Default 4D32

Quote:
Originally Posted by jazbo8 View Post
To make the SPICE models for the above two tubes, please provide their triode-connected characteristic curves.
I have the Raytheon datasheet for the 4D32 but it doesn't include triode-connected anode characteristics.

Google isn't being much help either. I don't have one to put on a curve tracer even if my curve tracers were capable of 1000V and 2.2A.
Attached Files
File Type: pdf 4D32.pdf (357.9 KB, 13 views)
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Old 11th June 2018, 05:33 AM   #1693
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Sorry, then you can try playing with the Model Paint Tool as suggested above.
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Old 11th June 2018, 05:35 AM   #1694
dch53 is offline dch53  Australia
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I recently found an LTSpice model for superimposing load-lines over standard characteristic curves.

It occurred to me that an LTSpice model that would generate anode characteristic curves from tube models would be very useful for assessing the quality of models.

Beyond my LTSpice abilities though. Does anyone have such a model?

Quote:
Originally Posted by jazbo8 View Post
Sorry, then you can try playing with the Model Paint Tool as suggested above.
Thanks!
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Old 11th June 2018, 05:48 AM   #1695
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
They are not really models, just simple schematics. All you need to do in the schematic is to sweep the voltage sources on the plate and the grid for a triode. For the pentode, you add another voltage source for the screen grid, and set the voltage per the datasheets. Before you can do that, make sure you have the correct symbol for the pentode, since many SPICE models online have their pins swapped around.
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Old 11th June 2018, 05:56 AM   #1696
dch53 is offline dch53  Australia
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Thanks. I'll give that a try.
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Old 17th June 2018, 08:16 PM   #1697
Ray Waters is offline Ray Waters  United States
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Default 6829 SPICE Model

Does anyone have a SPICE model for the 6829? Although I've seen people say that the 12AT7 is about the same as the 6829, a comparison of the two tubes' plate curves doesn't bear this out.


Thanks.
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Old 17th June 2018, 09:19 PM   #1698
rongon is offline rongon  United States
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Vacuum Tube SPICE Models
6829 = yet another interesting twin triode
https://frank.pocnet.net/sheets/138/6/6829.pdf

Definitely not the same as a 12AT7, but awfully close (mu is lower, so rp is lower, gm is about the same).
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Old 17th June 2018, 09:45 PM   #1699
jelanier is offline jelanier  United States
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6829_mod.jpg

Quote:
Originally Posted by Ray Waters View Post
Does anyone have a SPICE model for the 6829? Although I've seen people say that the 12AT7 is about the same as the 6829, a comparison of the two tubes' plate curves doesn't bear this out.


Thanks.
Try this. I just made this quickly, but it fits reasonably well.
(See attachment.)
Code:
.SUBCKT 6829 1 2 3 ; P G C; KOREN MODEL (TRIODE) 
+ PARAMS: MU=55 EX=1.31 KG1=298.75 KP=162 KVB=550 RGI=2000 
+ CCG=5.0P CGP=3.6P CCP=.57P ; ADD .7PF TO ADJ PINS, .5 TO OTHERS. 
E1 7 0 VALUE= 
+{V(1,3)/KP*LOG(1+EXP(KP*(1/MU+V(2,3)/SQRT(KVB+V(1,3)*V(1,3)))))} 
RE1 7 0 1G 
G1 1 3 VALUE={(PWR(V(7),EX)+PWRS(V(7),EX))/KG1} 
RCP 1 3 1G ; TO AVOID FLOATING NODES IN MU-FOLLOWER 
C1 2 3 {CCG} ; CATHODE-GRID 
C2 2 1 {CGP} ; GRID=PLATE 
C3 1 3 {CCP} ; CATHODE-PLATE 
D3 5 3 DX ; FOR GRID CURRENT 
R1 2 5 {RGI} ; FOR GRID CURRENT 
.MODEL DX D(IS=1N RS=1 CJO=10PF TT=1N) 
.ENDS
Hope this helps,

Jim
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Old 18th June 2018, 01:14 AM   #1700
cogsncogs is offline cogsncogs  United States
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Quote:
Originally Posted by Ray Waters View Post
Does anyone have a SPICE model for the 6829? Although I've seen people say that the 12AT7 is about the same as the 6829, a comparison of the two tubes' plate curves doesn't bear this out.


Thanks.
6829=5965, except lower Vp max (275 vs 300 for 5965, 330 for 5965A) and lower Pd.


Not to take away from jelanier's post, but here's two models I just made for use in LTspice, one in Curve Captor and one using Ayumi's method...


Curve Captor:
Code:
* ============================================================== 
* CK6829 LTSpice model 
* Modified Koren model (8 parameters): mean fit error 0.186067mA 
* Traced by Wayne Clay on 06/17/2018 using Engauge Digitizer and 
* Curve Captor v0.9.1 from Raytheon data sheet 
* ============================================================== 
.subckt CK6829  P G K 
    Bp  P K  I= 
+ (0.02268049449m)*uramp(V(P,K)*ln(1.0+(-0.02982574749)+exp((1.560781257)+ 
+ (1.560781257)*((66.6612651)+(-1067.129594m)*V(G,K))*V(G,K)/sqrt((40.14838418)**2+ 
+ (V(P,K)-(9.147083081))**2)))/(1.560781257))**(1.370120586) 
    Cgp G P 3.1p ; 0.7p added (2.4p) 
    Cgk G K 3.7p ; 0.7p added (3.0p) 
    Cpk P K 0.57p ; 0.2p added (0.37p) 
    Rpk P K 1G 
    d3  G K dx1 
.model dx1 d(is=1n rs=2k cjo=1pf N=1.5 tt=1n) 
 .ends CK6829
Ayumi Nakabayashi model:
Code:
*
* Generic triode model: CK6829_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Sun Jun 17 20:48:19 2018
*                 Plate
*                 | Grid
*                 | | Cathode
*                 | | |
.SUBCKT CK6829_AN A G K
BGG   GG   0 V=V(G,K)+0.17652075
BM1   M1   0 V=(0.019871805*(URAMP(V(A,K))+1e-10))**-1.5762085
BM2   M2   0 V=(0.48761325*(URAMP(V(GG)+URAMP(V(A,K))/25.784611)+1e-10))**3.0762085
BP    P    0 V=0.0047751592*(URAMP(V(GG)+URAMP(V(A,K))/52.879225)+1e-10)**1.5
BIK   IK   0 V=U(V(GG))*V(P)+(1-U(V(GG)))*0.005163113*V(M1)*V(M2)
BIG   IG   0 V=0.0023875796*URAMP(V(G,K))**1.5*(URAMP(V(G,K))/(URAMP(V(A,K))+URAMP(V(G,K)))*1.2+0.4)
BIAK  A    K I=URAMP(V(IK,IG)-URAMP(V(IK,IG)-(0.0025236727*URAMP(V(A,K))**1.5)))+1e-10*V(A,K)
BIGK  G    K I=V(IG)
* CAPS
CGA   G    A 3.1p ; 0.7p added (2.4p)
CGK   G    K 3.7p ; 0.7p added (3.0p)
CAK   A    K 0.57p ; 0.2p added (0.37p)
.ENDS
Attached Images
File Type: png CK6830_CC.png (40.1 KB, 99 views)
File Type: png CK6829-Rplot.png (103.8 KB, 99 views)
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