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Old 2nd December 2013, 05:44 PM   #111
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Quote:
Originally Posted by Zen Mod View Post

I know , main problem is still - short circuit between headphones of operator

especially in "younger" time
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Old 2nd December 2013, 08:09 PM   #112
yagoolar is offline yagoolar  Poland
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Quote:
Originally Posted by Zen Mod View Post
well , I'm dumb .... but that's hardly anything new .....

what I'm doing wrong ?

current from PSU to tube is 8A , but I'm still puzzled where is it going
Replace ^ with ** to convert syntax to LTspice model
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Old 7th December 2013, 11:22 PM   #113
Almeida100 is offline Almeida100  Portugal
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Default Different I/V curves for different brands of same tube type?

I tried the Joel’ pspice models, and noted that his library refers the tube brand datasheet, for every tube type, so I tried to see how different could be the I/V curves for some different brands of the same tube type.
Surprisingly, I came across with differences in Vp as great as 10% for the same Ip and Vg !
Have a look at the attached graphs, of the 12AT7 from BRIMAR, GE and MAZDA (Phillips).
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File Type: jpg 12at7_brimar.jpg (548.0 KB, 808 views)
File Type: jpg 12at7_ge.jpg (639.3 KB, 737 views)
File Type: jpg 12at7_mazda.jpg (459.5 KB, 703 views)
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Old 11th December 2013, 09:56 AM   #114
artosalo is offline artosalo  Finland
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I am looking for LTspice model for Soviet 12J1L (12Ж1Л).
Does anybody have ?
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Old 11th December 2013, 01:00 PM   #115
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Quote:
Originally Posted by artosalo View Post
I am looking for LTspice model for Soviet 12J1L (12Ж1Л).
Does anybody have ?
Freshly made, just out of the oven

Code:
*
* Generic pentode model: 12J1L_AN
* Copyright 2003--2008 by Ayumi Nakabayashi, All rights reserved.
* Version 3.10, Generated on Wed Dec 11 14:54:51 2013
*                Plate
*                | Screen Grid
*                | |  Control Grid
*                | |  | Cathode
*                | |  | |
.SUBCKT 12J1L_AN A G2 G1 K
BGG   GG   0 V=V(G1,K)+0.98709898
BM1   M1   0 V=(0.037076469*(LIMIT(V(G2,K),0,1e16)+1e-10))**-1.4371722
BM2   M2   0 V=(0.51069528*(LIMIT(V(GG)+LIMIT(V(G2,K),0,1e16)/13.197177,0,1e16)))**2.9371722
BP    P    0 V=0.0011571547*(LIMIT(V(GG)+LIMIT(V(G2,K),0,1e16)/25.841588,0,1e16))**1.5
BIK   IK   0 V=IF(V(GG)>0,1,0)*V(P)+(1-IF(V(GG)>0,1,0))*0.0010881412*V(M1)*V(M2)
BIG   IG   0 V=0.00057857734*LIMIT(V(G1,K),0,1e16)**1.5*(LIMIT(V(G1,K),0,1e16)/(LIMIT(V(A,K),0,1e16)+LIMIT(V(G1,K),0,1e16))*1.2+0.4)
BIK2  IK2  0 V=V(IK,IG)*(1-0.4*(EXP(-LIMIT(V(A,K),0,1e16)/LIMIT(V(G2,K),0,1e16)*15)-EXP(-15)))
BIG2T IG2T 0 V=V(IK2)*(0.84036243*(1-LIMIT(V(A,K),0,1e16)/(LIMIT(V(A,K),0,1e16)+10))**1.5+0.15963757)
BIK3  IK3  0 V=V(IK2)*(LIMIT(V(A,K),0,1e16)+5550)/(LIMIT(V(G2,K),0,1e16)+5550)
BIK4  IK4  0 V=V(IK3)-LIMIT(V(IK3)-(0.00064639118*(LIMIT(V(A,K),0,1e16)+LIMIT(V(G2,K),0,1e16)-LIMIT(V(A,K),0,1e16))**1.5),0,1e16)
BIP   IP   0 V=LIMIT(V(IK4,IG2T)-LIMIT(V(IK4,IG2T)-(0.00064639118*LIMIT(V(A,K),0,1e16)**1.5),0,1e16),0,1e16)
BIAK  A    K I=V(IP)+1e-10*V(A,K)
BIG2  G2   K I=LIMIT(V(IK4,IP),0,1e16)
BIGK  G1   K I=V(IG)
* CAPS
CGA   G1  A  0.007p
CGK   G1  K  2.4p
C12   G1  G2 1.6p
CAK   A   K  3.7p
.ENDS
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Old 11th December 2013, 01:52 PM   #116
artosalo is offline artosalo  Finland
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Thanks. I will test this at once.
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Old 19th December 2013, 11:08 PM   #117
kevinkr is offline kevinkr  United States
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Vacuum Tube SPICE Models
Default Installing Tube Libraries In LTSpice

OK so you want to install a collection of tube models and their supporting symbols. Note both are provided with no warranty implied or otherwise.

There are two directories you need to locate. LTspice is a 32 bit program and will be installed in program files in xp or Program Files (X86) in Win 7. Locate the LTC folder..

Path to tube symbols is \LTC\LTspiceIV\lib\sym - unzip the tube_sym zip and paste the folder here.

Next step:

Path to tube library is \LTC\LTspiceIV\lib\sub - unzip the tube_lib zip file and paste the file here.

Start LTspice and under the component folder (AND gate on the menu) you will see a folder called 'Tubes' click on this and you will find diode, triode, tetrode, and pentode folders. Click on the folder of your choice and you will get a number of choices. I have lots of triode models and fewer pentodes, tetrodes and diodes. A few models may be funky, but most work ok.
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File Type: png symbols.PNG (139.6 KB, 576 views)
File Type: png lib path.PNG (156.6 KB, 565 views)
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File Type: zip Tubes_sym.zip (31.6 KB, 251 views)
File Type: zip tube_lib.zip (16.7 KB, 270 views)
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Old 21st December 2013, 09:14 PM   #118
Dominique_free is offline Dominique_free  Switzerland
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Quote:
Originally Posted by kevinkr View Post
Quote:
Originally Posted by jazbo8 View Post
<snip> To use those models in LTSpice, you need to manually edit the *.inc files by replacing all the "^" with "**" in the text. I think you will find those models superior to the ones by Koren, Munro, etc.
On linux, it is just to decompress the archive, go into the directory where the inc files are, and run:

Code:
for i in *.inc; do sed -i -e 's:\^:**:' $i; done
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Old 21st December 2013, 10:40 PM   #119
RajkoM is offline RajkoM  Bosnia and Herzegovina
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Hi jazbo8,
can you make a spice model for 18040 pentode with Ayumis method, please.
Lack of diagrams is no Ug1 =0 and -0.5 V.
Thank you.
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Old 22nd December 2013, 05:40 AM   #120
jazbo8 is offline jazbo8
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Vacuum Tube SPICE Models
Do you have a triode-connected curve for it? The Ayumi method requires it...
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