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Vacuum Tube SPICE Models
Vacuum Tube SPICE Models
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Old 12th September 2021, 04:31 PM   #3091
OldHector is offline OldHector  Sweden
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Join Date: Jun 2018
Location: Täby, Sweden
Default Never ending saga ...

All of this advanced LTSpice usage leaves me a bit ashamed to bring up another issue with my simulation.

It was working perfectly, then I saw that I had got the OPT inductance wrong, it was 400H not 500H, so I reworked the windings and updated the model. Then it just stopped working. It all goes to pot after the phase splitter.

Unfortunately I lack the experience with this tool to iterate around standard issues, and divide and conquer.

Also, what is a reasonable line input level to work with? My resistance divider (40k + 60k) is meant to represent a potentiometer. I have reduced the amplitude of the input sine wave to 0.5V. I will lose some gain when I manage to get the NFB correct.
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File Type: asc SPP_EL84_1a.asc (8.2 KB, 16 views)
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Old 12th September 2021, 06:06 PM   #3092
Koonw is offline Koonw
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Remove the two "43% tap", they short circuited your OT primary.
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Old 12th September 2021, 06:33 PM   #3093
OldHector is offline OldHector  Sweden
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Join Date: Jun 2018
Location: Täby, Sweden
Thanks, I'd have never spotted that.

I thought they were just labels, and I just changed the text from '40% tab' to '43%', so I don't really understand what I did? How did you see it?
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Old 12th September 2021, 08:55 PM   #3094
Koonw is offline Koonw
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Join Date: Apr 2013
One 40%Tab1 and the other 40%Tab2 is ok as long as they're not shorting out. I changed the circuit to Pentode mode and it worked, I must have moved the 2 tabs away so the circuit become operational. I check a few area wonder why UL mode not working, knowing the circuit is fine, same as you, then I spot it. It will happen if it copied as Ltspice will not change the 2 same labels, like "Tp1" or "40%", include this in troubleshoot checklist.

Last edited by Koonw; 12th September 2021 at 09:13 PM.
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Old 13th September 2021, 05:11 AM   #3095
OldHector is offline OldHector  Sweden
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Location: Täby, Sweden
Now I understand, thanks!
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Old 13th September 2021, 05:39 AM   #3096
qiuchun63 is offline qiuchun63  China
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Location: BEIJING
Koonw, can you give me a 805 tube model? thank you!
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Old 13th September 2021, 07:21 AM   #3097
Koonw is offline Koonw
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Join Date: Apr 2013
I posted 805 here before, let's know if any problem.


Vacuum Tube SPICE Models
Vacuum Tube SPICE Models


Also Ayumi model is in zip files downloaded from the forum see post at the beginning of this thread.
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Old 14th September 2021, 12:52 AM   #3098
qiuchun63 is offline qiuchun63  China
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Koonw,Thank you very much.
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Old 14th September 2021, 01:39 PM   #3099
NickKUK is offline NickKUK  United Kingdom
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Join Date: Dec 2019
I've only seen one reference to this model and it's Koonw's post in a 12BH7A thread.

Quote:
**** 12BH7A_STR ** Advanced Grid Current **********************************
* Created on 08/24/2020 14:31 using paint_kit.jar 3.1
* Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively
* Plate Curves image file: 12bh7a-str.png
* Data source link:
*----------------------------------------------------------------------------------
.SUBCKT 12BH7A_STR 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=2.9P CGP=2.5P CCP=0.5P
+ MU=18.02 KG1=945.75 KP=185.4 KVB=1247.69 VCT=-0.6206 EX=1.181
+ VGOFF=-1.03 IGA=8.2E-4 IGB=0.162 IGC=6.624 IGEX=1.3
* Vp_MAX=500 Ip_MAX=16 Vg_step=2.5 Vg_start=5 Vg_count=12
* Rp=4000 Vg_ac=55 P_max=3.5 Vg_qui=-48 Vp_qui=300
* X_MIN=279 Y_MIN=106 X_SIZE=857 Y_SIZE=593 FSZ_X=1618 FSZ_Y=918 XYGrid=true
* showLoadLine=n showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=y
* showIg1=y gridLevel2=y 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
RE2 2 0 1G
EGC 8 0 VALUE={V(2,3)-VGOFF} ; POSITIVE GRID THRESHOLD
GG 2 3 VALUE={(IGA+IGB/(IGC+V(1,3)))*(MU/KG1)*(PWR(V(8),IGEX)+PWRS(V(8),IGEX))}
.ENDS
*$
From this thread: 12BH7 and questions about its operating conditions is AB or A1
__________________
V1 - low gain tube HPA OTL, fully balanced cascode 12BH7A, 12BH7A CCS, 12BH7A drivers and ECC99-BJT hybrid circlotron. (build)
V2 - pure digital tube HPA, RF-tube DSD512 modulation with mosfet output stage. (initial design)
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Old 20th September 2021, 02:17 AM   #3100
Koonw is offline Koonw
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Join Date: Apr 2013
Type 50 EML model:
Type 50 Emission Labs Data Sheet


Code:
**** EML50 ** Advanced Grid Current **********************************
* Created on 09/19/2021 21:40 using paint_kit.jar 3.1
* Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively
* Plate Curves image file: EML50.png
* Data source link: http://www.emissionlabs.com/datasheets/50-curves.gif
*----------------------------------------------------------------------------------
.SUBCKT EML50 1 2 3 ; Plate Grid Cathode
+ PARAMS: CCG=3P  CGP=1.4P CCP=1.9P 
+ MU=3.951 KG1=3670.57 KP=57.29 KVB=629.46 VCT=-5.04 EX=1.395 
+ VGOFF=-0.6 IGA=0.001 IGB=0.3 IGC=8 IGEX=1.64 
* Vp_MAX=650 Ip_MAX=150 Vg_step=15 Vg_start=0 Vg_count=11
* Rp=4000 Vg_ac=55 P_max=35 Vg_qui=-48 Vp_qui=300
* X_MIN=65 Y_MIN=10 X_SIZE=699 Y_SIZE=563 FSZ_X=1296 FSZ_Y=736 XYGrid=false
* showLoadLine=n showIp=y isDHT=n isPP=n isAsymPP=n showDissipLimit=y 
* showIg1=y gridLevel2=y 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 
RE2 2 0 1G 
EGC 8 0 VALUE={V(2,3)-VGOFF} ; POSITIVE GRID THRESHOLD
GG 2 3 VALUE={(IGA+IGB/(IGC+V(1,3)))*(MU/KG1)*(PWR(V(8),IGEX)+PWRS(V(8),IGEX))}
.ENDS 
*$

DHT model:


Code:
**** EML50 ** Composite DHT with Advanced Grid Current **************
* Created on 09/19/2021 21:39 using paint_kit.jar 3.1
* Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively
* Plate Curves image file: EML50.png
* Data source link: 
*----------------------------------------------------------------------------------
.SUBCKT DHT_EML50_A2 1 2 3 4 ; P G K1 K2
+ PARAMS: CCG=3P  CGP=1.4P CCP=1.9P RFIL=6
+ MU=3.951 KG1=3670.57 KP=57.29 KVB=629.46 VCT=-5.04 EX=1.395 
+ VGOFF=-0.6 IGA=0.001 IGB=0.3 IGC=8 IGEX=1.64 
* Vp_MAX=650 Ip_MAX=150 Vg_step=15 Vg_start=0 Vg_count=11
* Rp=4000 Vg_ac=55 P_max=35 Vg_qui=-48 Vp_qui=300
* X_MIN=65 Y_MIN=10 X_SIZE=699 Y_SIZE=563 FSZ_X=1296 FSZ_Y=736 XYGrid=false
* showLoadLine=n showIp=y isDHT=y isPP=n isAsymPP=n showDissipLimit=y 
* showIg1=y gridLevel2=y isInputSnapped=n 
* XYProjections=n harmonicPlot=n dissipPlot=n 
*----------------------------------------------------------------------------------
RFIL_LEFT    3  31 {RFIL/4}
RFIL_RIGHT   4  41 {RFIL/4}
RFIL_MIDDLE1 31 34 {RFIL/4}
RFIL_MIDDLE2 34 41 {RFIL/4}
E11 32 0  VALUE={V(1,31)/KP*LOG(1+EXP(KP*(1/MU+V(2,31)/SQRT(KVB+V(1,31)*V(1,31)))))}
E12 42 0  VALUE={V(1,41)/KP*LOG(1+EXP(KP*(1/MU+V(2,41)/SQRT(KVB+V(1,41)*V(1,41)))))}
RE11 34 0 1G
G11 1 31 VALUE={(PWR(V(32),EX)+PWRS(V(32),EX))/(2*KG1)}
G12 1 41 VALUE={(PWR(V(42),EX)+PWRS(V(42),EX))/(2*KG1)}
RCP1 1 34 1G
C1 2 34 {CCG} ; CATHODE-GRID
C2 2 1 {CGP} ; GRID=PLATE
C3 1 34 {CCP} ; CATHODE-PLATE
RE2 2 0 1G
EGC1 81 0 VALUE={V(2,31)-VGOFF} ; POSITIVE GRID THRESHOLD
GG1 2 31 VALUE={0.5*(IGA+IGB/(IGC+V(1,31)))*(MU/KG1)*(PWR(V(81),IGEX)+PWRS(V(81),IGEX))}
EGC2 82 0 VALUE={V(2,41)-VGOFF} ; POSITIVE GRID THRESHOLD
GG2 2 41 VALUE={0.5*(IGA+IGB/(IGC+V(1,41)))*(MU/KG1)*(PWR(V(82),IGEX)+PWRS(V(82),IGEX))}
.ENDS 
*$
Attached Images
File Type: jpg 50 EML paint.jpg (244.2 KB, 59 views)
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